If I pick up a Switch with Smash (still considering when to get it) then I'd probably be down for some matchen. Although I don't think the connection between Europe and America is going to be too hot. Especially with the Smash netcode, which I suspect won't be too good.
But hey, at least I can blame the lag when I lose.
Don't worry, Nintendo charges money for online now, so it's gonna be great!