I was very intrigued by Habu's proposal for eventually having a game which features every Digimon (even if he claims it'd take 8 years.... hell, I'll wait 80 years, I just want it), but part of me wonders what Bamco would consider "every Digimon", since there are quite a lot that still have yet to see a Reference Book profile, or even a single piece of official artwork. Still, the fact that Digimon like Red V-dramon and the entire Arkadimon line (even the Baby form) got recent/upcoming revivals in the games leaves me rather hopeful.
Blikmon was rather odd.... it appeared in the first Digimon World, where it wasn't even considered a Digimon (just an NPC called the "Blik Doll"; the English localization did refer to it as a Digimon, though). Then the model got re-used in Digimon World 2, where it was established as its own Digimon (where it was a Perfect Data).... and then after that, nothing. It didn't even get an appearance in the card game whereas just about every other monster debuting in Digimon World did. I'm not sure why it suffered as it did, but I'm hoping it sees a revival.
I wouldn't mind seeing the Golemon from the first Digimon World be re-established as its own Digimon. Same with Digimon World 3's version of Black Seraphimon.
I don't think ToyAgumon-L is cause for concern. It's really just ToyAgumon (Black) but with a different name. Digital Card Arena introduced a few recolors like the red Otamamon and the violet Elecmon, but in those games, their names were distinguished by having a letter after them (guess they didn't wanna bother coming up with a completely new name to distinguish them like with the Digimon World recolors). I'm assuming you think that ToyAgumon-L is a different Digimon from ToyAgumon (Black) because L is supposed to be translucent like ClearAgumon. If you look at its appearance in most media, that's actually the case. The only exception that I'm aware of is its appearance in Frontier (which I'd chalk up to the animators not wanting to bother with a translucent effect on a small army of enemies of the week).
I don't know what the deal is with Pippimon, but thankfully, since the time of its introduction, the franchise has moved away from forcing one BabyII to every BabyI, so it should be able to fit into any existing evolution chain without much issue (I'd picture it evolving into Chapmon).
As for HolyDigitamamon and all those other contest winners..... yeah, I'm not sure why Bamdai/Bamco's been sitting so long on those guys, but hopefully they'll still get released eventually. We did get Mermaimon and Witchmon after quite a few years.
I'm not sure every single minor fusion in Xros Wars or the Xros-Ups really needs to be acknowledged as their own Digimon. I mean, do you look at MailBirdramon+Golemon and think of a whole new Digimon, or just a minor, temporary power-up? And really, I wouldn't be surprised if a majority of these were just the result of Toei screwing around with the gimmick without any input (or even consent) from Bamco (not to mention the sheer laziness of some of these designs, in both appearance and naming.... honestly, could the name of that DaiPenmon+IceDevimon fusion be any more of a mouthful? And honestly, I'll be perfectly fine if Dorbickmon+Huanlongmon never sees the light of day again). And let's not even get into every minor fusion DarkKnightmon went through in the manga. Overall, I'd say if they don't have official artwork, didn't appear in any other media (like Digimon Collectors or the Super Xros Wars games), and just isn't very distinguishable (as opposed to, say, ReverseWeddinmon), I don't think it should be noteworthy enough to count as a unique Digimon.
Likewise with Cheergalmon and those Digimon from the CD drama, they just come off to me as one-off gag Digimon, nothing more (we might as well count Takato's early sketches for Guilmon's Perfect form or Takeru's envisioned Adult forms for Patamon as Digimon in need of a revival).
And as for all those other minor Digimon from the games or other media, as I said before, they're liable to see a revival someday. Thankfully, the fans certainly haven't forgotten them, and if Bamco gets pestered enough, they could bring them all back. Amusingly, from what I've seen of the Japanese Digimon Game Community, a few Japanese fans are aware of Citramon and asking he be made official, same with Sleipmon Burst Mode and ChaosDukemon Chaos Mode. But I wonder about those Digimon World 3 enemy recolors (even though they seem to have their share of fans as well).
Anyway, some obscure Digimon I'd personally like to see: Impmon and Monodramon's BabyI and II forms. Baby Digimon have a hard time appearing in any media as is (partly due to not even being playable at all in the card game, for the most part), but these guys seem especially forgettable. There's no profile artwork, and while the BabyIIs got to appear at the end of Tamers, the BabyIs aren't near as lucky. Go on Wikimon, Ketomon only has a game sprite as its sole image, and Kiimon barely even exists (only ever being mentioned in an animation artbook, I think). I'm just glad that Arkadimon's Baby is coming back in Hacker's Memory, 'cause it's another Baby form that seemed liable to be doomed to obscurity (and should it not have appeared with the rest of its line, who knows when or if it'd get to be introduced in the Story series).
Also, Master V-dramon. Given the aforementioned revival of Red V-dramon, Master could have a shot. Though, I wouldn't mind them retconning its coloring (it's just a barely noticeably different shade of blue from V-dramon... like you'd have to be comparing both of their D-1 Tamers sprites very closely to even tell). The black V-dramon too, for that matter (it only appeared on one card, which used a 3D model instead of any artwork).
And finally, some theoretical Digimon I'd love to see. There's the remaining Chessmon: KingChessmon (Black), QueenChessmon (White), and RookChessmon (White) (a black BishopChessmon already appeared in Xros Wars). And I'd like them to fill out those remaining Hybrids, at the very least a Fusion form for the Earth, Water, Steel, Wood, and corrupted Dark Spirits (especially that last one; Duskmon and Velgmon were too awesome not to deserve one, and Lowemon and KaiserLeomon can not replace them). From there, a Transcended form for all of them (with KaiserGreymon and MagnaGarurumon thus far being the only ones), and maybe a Child form (in the same vain as Flamon and Strabimon). Also, the remaining none-Ancient versions of the Ancient Digimon (Wisemon was released after AncientWisemon as I recall, so it seems like the others could all have one).