Which fan theories aren't wishful thinking lol.i mean, obviously they will have something. they always do. it just might be that that something is mario if this rumor is to be believed. and if the ports are remasters that can take a fair amount of work. and if they have 5 or 6 remasters in progress that would consume a lot of their development.
Either way I would be surprised if Nintendo didn't at least have some big hitter near the end of the year. Switch is an old enough system that it shouldn't be relying on ports.
....it just sounds like a weird business decision to make imo.