Don't call my boy dead... He's great... 'C'MON' lol
For real tho! We don't need to re-invent the wheel with Star Fox, that's primarily why most of them haven't been as successful since N64. Just make a game almost exactly like that one, introduce a customization option like you mentioned, an online option like you mentioned that let's you either co-op missions or dogfight and there ya go. Simple.
Why hasn't this happened yet?
Also, F-Zero should've been on every console since the WiiU with a crazy handle-steering schtick where you use the pad to do stuff with your ship. Don't know why this franchise has been dormant when the tools are right there in front of it.
And for DK they really have zero excuses when they can literally do exactly the same thing that they're doing for Mario and Kirby games and just adapt it to that playstyle. It really isn't rocket science.