Even then, I still can't expect the game to be as big character-wise. It just seems like so much will be thrown on the wayside, and it's not like anyone who missed the mark for Ultimate will get a chance later. They're went from "Never-Ever" to "Forever-Never (and Ever)"
If characters like Rayman and Shantae are Spirits and Heihachi is a taunt cameo, then I do get your point.
I'm just saying that if you feel like that this is the only chance you will ever have to have a line-up of this nature, I'd probably try to keep the project going as long as possible. The console is very young, and unlike the Wii U, which was pretty much DOA, there is a lot of money potentially there for Nintendo to be interested in keeping Smash Bros. operating on a limited capacity until at least 2021 or 2022, even. It's whether or not Sakurai is up to taking time off during this time period.