Same for Smash Bros.
I don’t know what they will do to scope down but make people perceive the same value.
It's an interesting problem, and the Switch 2 potentially being fully backwards compatible makes it even more complicated. As far as I can see, they have two possible routes they can take it:
1. A full-on 4K remaster where the focus is on improved visuals and stability and having the complete package, including all prior DLC (really, truly EVERYONE is here). There's not much room to grow here, but you may get people to double dip, especially if it's released around launch.
2. A much smaller roster with a laser focus on everything being NEW: new characters (or, at the very least, new movesets and variants for existing characters), new levels, new items, and maybe even a new core gimmick. You coukd even start with a core of new characters, then have them "rescue" the classic characters to unlock them. As for a new gimmick, I'm thinking something more fundamental than the Smash Ball, something like character switching a la MvC.
I guess a bonus third option that I don't really see them trying is the genre switch. Smash Bros could completely jump the tracks and turn into a hero shooter, a Warriors-style co-op brawler, a MOBA, a kart racer, etc. etc. etc. In any genre, you could carry over some Smash DNA to give it a unique feel, for example, maintaining ringouts with damage influencing how far you fly rather than health bars. Reimagining fan-favorite 2D fighting arenas as full 3D environments could hook fans as well. Still, you can't assume the audience that bought 50+ million copies of Ultimate are willing to just jump with you to a new genre, which makes this approach risky to the point where I don't really think it's on the table.