I know this is one Smash 5 newcomers, but I didn't think of really wanting to make a seperate thread for all this.
Considering Nintendo's use of DLC. I can imagine when a Smash 5 comes. There might be a period where the initial roster seems like it has alot of cuts even ones that would be blasphemous if they happened in an earlier time so they can spend more time on whatever newcomers they're working on. But that's because they're saving characters for DLC.
Personally I think with the debut of DLC in Smash 4. The idea of cutting has lost some of it's possibility aside from those who have the concern such as Technical limitations on a particular console (Ice Climbers) or issues regarding to licensing or the company is falling under hard times (Snake). But remove those problems and you know those characters are back too (Snake's return would be a lot harder though considering)
But anyway, the idea is that there's less need to be afraid of a character being cut completely. Cause even if they're not in the initial roster they'll probably show up later as DLC. Sure, people would still be pissed that they weren't there from the beginning. But I imagine as long as they end up in the game, they're not really cut per se.
Though considering DLC likely extends the life of Smash 4, it may be a long while til' we get to a true Smash 5. But if/when that day comes I think it will be DLC galore then.