Star Fox needs to return, albeit with a new spin. I think Miyamoto is too headstrong and needs to stray away from SF64. Might benefit Star Fox if they tried an exploration style where you could freely roam and even explore planets on foot. It'd be a higher budget game, but that's what it takes to get people invested. The world has changed since the nineties.
F-Zero though? I don't think there's much of a point now. Not that the two can't coexist, but you know that between the two, Mario Kart will always win. If one racing game is already a massive success, why would you care about making a second? It doesn't surprise me that F-Zero has stayed dormant for so long, and I feel like the best and most realistic future for Captain Falcon is becoming playable in Mario Kart.
EarthBound is wasted potential. I know it bombed when it first released, but man, people would devour that series in 2021. RPGs are popular, and the setting appeals to the West far easier than most of the stuff we get.