Lets not forget many of these publishers have done android ports and portable games and many of these titles will be a logical easy port to Switch due to its arm cores with major enhancements hopefully.
I think if Nintendo had gone down the route of AMD Zen architecture then x86 + Radeon ports would have been easier and more likely to happen but its ARM based, powerful ARM admittedly and Nvidia GPU its not going to be as easy.
More importantly it is a cartridge based system and will not be cheap to produce a Switch version of a game on cartridge. I suspect third parties will limit themselves to smaller cartridges due to costs and there more likely make enhanced versions of android games rather than cutdown versions of pc/ps4/xbone games.
I personally have very little expectation that the Switch will get included in the support list of major triple 'A' games .most of the time, I'm sure there will be a few exceptions.
