We'll have to wait and see, but if Nintendo can pull another year similar to 2017 with 2018... THAT would be something. We'll see how many between Metroid, Pokemon, and the Retro game see release in 2018, for starters.
Switch already has a nice library of exclusives. However I find myself intentionally not buying games on the PS4 just to wait and see if they come out on the Switch. For example I am holding off on Dragon Quest Builders. Actually I am intentionally not getting Dark Souls 3 either, because I want to wait for a few months and see if they announce it for the Switch. If I can have a game portable and in cartridge format, then I am definitely buying that version. I don't even care if the graphics are slightly worse.
I'm doing the exact same thing. Being able to play on the go/in bed/on the porch/wherever is just a bigger asset than I ever believed it would be.