Switch! Record breaking first year, Labo around the corner (which has the potential to be huge and sell to a completely new market). This will be the first console to have massive 3D Mario games, Zelda games and also mainline Pokemon.
I think the Switch has a good chance to beat PS4 to 100 million (launches aligned).
If it doesn't, I don't see it selling less than 100 million lifetime at this point.
1doesnotsimply