That's what I don't get about the "Smash needs a reboot" crowd. Yeah they could change the gameplay, but like...why? What gameplay change would be worth a full reboot? Especially when the roster, not the gameplay, is the selling point.
I can only speak for myself, but as someone who has consistently done Smash 6 ratings in the RTC thread I have this to say:
For me it comes down to one assumption: Nintendo likely wants to keep Smash going even if Sakurai retires or takes a back seat. This is assuming Nintendo continues to make consoles - which is not guaranteed - but why stop a money-printing machine? No matter if Ultimate DX happens or how Nintendo moves after the Switch, Smash 6's gonna arrive someday. The later, the older Sakurai will be (he'll turn 50 next year).
It's a difficult position, but it's kinda akin to Nintendo / TPC wanting another Pokemon game when their primary handheld line (Game Boy to 3DS) got practically replaced by the Switch. I'm not gonna give a detailed opinion on Sw / Sh, but to put it simply: It looks rushed in some areas. Not gonna lose sleep over it though. The NatDex thing was inevitable one gen or the other simply because of the ever-increasing size. Not saying Pokemon cuts was justified in this context, saying that it was gonna happen one way or the other. Especially if there's been a time crunch on the development.
This is where one can draw a useful comparision to the probable Smash 6 cuts. Smash 6 is likely to arrive way into the future (I'm guessing 2025 at the very earliest) because it's not gonna come to the Switch. That's far into the future when it comes to this field, but one can assume A) Ninty might not be able to renew every single third party contract and B) There could be some pressure within Ninty to "cut the fat" with some characters (cue enraged comments on the Net, as per Sw / Sh). Now this becomes a major tightrope walk.
As such Smash 6 needs to:
* Not be rushed. It's to early to tell how Sw / Sh is doing, but Ninty will want to avoid another PR storm - especially with Smash. And especially if Sakurai does not return. If anything Sakurai set the bar
high.
* Introduce not only new gameplay mechanics, but also include some other hook. Tighter story, considering Sakurai has dabbled in Subspace and WoL? Improved online? New modes? They'd need something substantial.
* Compensate for the probable roster cuts. Smash 6 is not likely to retain the exact same dev team or code (which is what helped Ultimate). If the roster cuts are major, expect a mix of fan favorites, new IPs and third parties. Also, we can't tell the size of Smash 6's roster, but I personally feel 55-60 will be the absolute minimum.