I'd like to see Fallout 3 / NV on the Switch. Not sure if it can handle Fallout 4.
The Switch should also get some more competitive shooters this year. Overwatch should be brought to the console, and the next COD should be on the platform as well (it's already rumored to be BLOPS4 done by Treyarch, and they have a history of bringing their COD titles to Nintendo consoles).
Overwatch is a maybe at best.
Doubt the new COD will be able to run on Switch either.