Porting is just one problem.
The other problem is (sadly) Nintendo's own buyer base.
They turned their nose up at perfectly good/playable ports like COD and Assassin's Creed on the Wii U launch and shunned things like Need For Speed because they were a few months late. Even an exclusive like Zombi U didn't sell well.
If they wouldn't buy these games because of very minor differences in performance or a game being a couple of months late (yes, heaven forbid developers prioritize two platforms with 80 million users each over your 0 userbase ... lets be real), then I doubt they are going to deal well with much bigger differences with PS4/XB1.
The Wii U was at least much closer and better in some areas than the PS3/360, the Switch won't be so favorable vs a PS4/XB1.
It doesn't really matter if a third party bothers to port or not if no one is going to buy any of the games. I think a large part of the Nintendo community doesn't really even want these games, they just want to be able to use it as a bullet point in online arguements with Sony/MS fans "we have the same games as you, neener, neener, neener!". But actually buying them? Hell no, they mainly only buy Nintendo games.
Developers are not going to prioritize a Switch port when PS4 has 50 million users already, XB1 has 25 million, and then there's PC too.









