It's perfectly viable.. All systems are perfectly viable that hasn't already been retired. But Switch more than Wii, Gamecube, Or Wiiu is a viable only system. It really depends on how fussy you are. I'm fussy enough that I end up owning all systems at one point or another because there's always a game I want to play that is exclusive to one system or another. But I could get over it if I wanted to. I mostly play Switch right now. Still catching up on exclusives I want to beat. I'm a completionist so it takes me a long time with each title. I imagine that at a certain point I will focus on PS5 or Xbox Next but I'm sure Nintendo will pull me back in after that with a new hardware revision and a great lineup of exclusives.