Honestly a nice list you have there.
Final Fantasy XV isn't happening though. Not because I think it is impossible, I think MAYBE they could get it to work. But they don't WANT to get it to work. Not because of Nintendo, but because of the Luminous Engine. That engine has been a source of constant headaches for Square, I imagine by now they thoroughly hate that engine. They want to finish their obligations to FFXV and leave that engine behind never to return.
Final Fantasy VII is much more plausible, but the Sony entanglements could be an issue there. But I could see Square wanting it because they know wherever this is released it will essentially print money.
And I agree, Pokken Tournament with all the new arcade content and some new Switch content makes a lot of sense.