Yes, I can easily imagine someone else being the director of future Smash games, and I hope that there will be someone replacing him. While I do appreciate the smash games so far, I think Sakurai is too Nintendo-esque in forcing his way of things, even if they are not up to date. Smash needs to evolve past the brawling game that 'the whole family can play' and should move in the direction of esports. I'm not calling on gameplay and mechanics, but simply improving online play, an easy way to host matches with certain rules for everyone, easy friend making, net stability and so forth.
No matter how the game itself is played, it should orientate itself towards online play, as 4 player on one couch action practically has been declining for years.