I mean, technically we could see the next Smash game next week. Just imagine a direct's playing and you hear the Smash trailer soundbite. And then bam, suddenly there's a Smash gacha game for mobile devices with horrendous controls and monetization. That can happen at any moment in our lives and nothing,
absolutely nothing, can be done to stop it. After all, it's never been specified that the next Smash needs to be a console game
Psychological horror and jokes aside, I don't think the next
(real) Smash has to be far away. I believe the next console's definitely a "sooner rather than later" thing. And, well, you'd want a Smash title out for that as soon as you can really. Genuinely wouldn't be surprised if development's already started on it.