A Star Fox Zero port is tricky because arguably more than any other potential Switch title, its entire gameplay concept relies on the gamepad so the game would have to be massively overhauled. Such a level of work needed may not be utilized given how low its sales were (with the vast majority of the first party Wii-U games that have been ported were ones that sold at least one million on the system. And quite frankly past the unique camera system there's really not much to the game, just a meh retread of SF64 with the multiple path system not nearly as well executed.
At this point it feels like Star Fox is at a crossroads. The self fulfilling prophecy of its existence seems pretty obvious; Nintendo not really investing in it like they should, the games undersell, and they're even less inclined to put money into the next time. At this point the franchise can retire, go the Mega Man route via modest budget titles that acknowledge their status as shorter rail shooters, or the company bites the bullet and goes with a full blown significant Star Fox game to genuinely revitalize the franchise with a big scope,, a healthy marketing budget, and perhaps most importantly of all, no gimmicks.
While I've mentioned before what I think a game like that should be (a lot of inspiration from open world of Starlink with multiple ships/characters and some select on rails segments to still stay true to the series roots), I think such a game could still move the series' story forward if they played it right. Have a central plot within the on rails segments playing as Fox (and maybe playing as one other character), so there's still a core narrative and plot specific pilot banter. But if a sandbox approach to everything else is allowed, then there's built in in replay value while satisfying those who want the experience of different ships/pilots. So yeah while the story might focus on Fox, one could still play as a Falco or Krystal in the game's setting if they wished.
And if they utilized the Starlink scanner function in a manner like the Metroid Prime series does, you could even expand the lore of SF in general without cutscenes that might get excessive to gameplay oriented players. Those that want to really dive into the history of the Lylat system could be scanning everything on Fichina during flights while those not interested will just focus on the mission; satisfying one type of SF player without turning off the other. And given that such data entries would be text based, you could on occasion have some unique responses based on which pilot you have when scanning. Like Krystal having a distinct comment when learning some ship or ruins is connected to Cerinia for example.