I'm only buying a switch because of AC, the same reason I bought a 3DS when I already had a DS
My guess is that it will be on the Switch hopefully at the end of next year. They said the app is supposed to go with the game and that shouldn't be too long until its released (damn super Mario run). Also I think ?20 a year is a pretty good deal but it it's like ?10 a month I doubt I'll be playing online very much.