Something that always bothered me about the Mega Man Legacy Collection is that they didn't include Megaman and Bass. The SNES one was actually half-decent, lacking many of the screen-size problems of the GBA port, and a simple language patch from Japanese to English could have worked wonders in improving the general perception of it, in my opinion.
I get that it was difficult to really release them all, but a sort of "Mega Man Legacy Collection Definitive Edition" could be cool, if it includes some more obscure picks alongside the ones we already have - maybe throw in all of the Gameboy titles, or just V if you're short on space, toss in a language-patched Challenger From The Future, maybe add the CVS system titles as well, or even stuff like Battle and Chase! Am I just too Mega Man obsessed?... probably, yeah.
Now I think he'd be neat but I don't really have much investment in seeing him make it in. If he's in, cool, but there's plenty of other characters that I think would be much cooler.