Well, if we're going to go back into talking about port vs. no port, here are some more thoughts:
I personally don't relate to this fear of not being able to top Ultimate.
Overall technological capabilities are only going up with time, Nintendo's and Sakurai's knowledge on how to make a game like this only goes up, and the allowed budget you would only expect to increase as well. You just might not have the ability of reusing assets as heavily next time, and potentially the more advanced hardware would require more resources to develop for. But at a fundamental level they are now more capable of making a ground-up Smash game than they were when they made 4, and that game had over 50 characters. Despite my arguments for cuts being bent into people saying that I want the total roster size chopped in half or something, I still think the total character count could easily be 60+, at the very least with DLC, if they made a ground-up Smash game and not a port. That's more than enough characters to put together a compelling roster, especially if they don't do EiH and actually put their heads together on how to make proper Zelda, FE, etc. rosters.
Even if you don't think they can "top" Ultimate, Nintendo doesn't really have to. They just have to give the new project enough to make it its own game with its own identity. And they're the experts at doing that in gaming anyway. There are plenty of ways to do this, from new mechanics to new modes to even the new characters on their own. People will get hungry for Smash again, and when they do, they will buy. No, they're not going to try to lowball people into buying a game with Brawl's roster size, probably not even 4's, and they are more than capable of topping those games even without asset reuse. A slightly smaller roster than base Ultimate isn't going to stop the project from being massively profitable, especially if they have a new stock of creative USPs alongside it.
I personally don't relate to this fear of not being able to top Ultimate.
Overall technological capabilities are only going up with time, Nintendo's and Sakurai's knowledge on how to make a game like this only goes up, and the allowed budget you would only expect to increase as well. You just might not have the ability of reusing assets as heavily next time, and potentially the more advanced hardware would require more resources to develop for. But at a fundamental level they are now more capable of making a ground-up Smash game than they were when they made 4, and that game had over 50 characters. Despite my arguments for cuts being bent into people saying that I want the total roster size chopped in half or something, I still think the total character count could easily be 60+, at the very least with DLC, if they made a ground-up Smash game and not a port. That's more than enough characters to put together a compelling roster, especially if they don't do EiH and actually put their heads together on how to make proper Zelda, FE, etc. rosters.
Even if you don't think they can "top" Ultimate, Nintendo doesn't really have to. They just have to give the new project enough to make it its own game with its own identity. And they're the experts at doing that in gaming anyway. There are plenty of ways to do this, from new mechanics to new modes to even the new characters on their own. People will get hungry for Smash again, and when they do, they will buy. No, they're not going to try to lowball people into buying a game with Brawl's roster size, probably not even 4's, and they are more than capable of topping those games even without asset reuse. A slightly smaller roster than base Ultimate isn't going to stop the project from being massively profitable, especially if they have a new stock of creative USPs alongside it.