I think its safe to say that at the very least Smash 5, Pokemon, Super Mario Party and Octopath Traveler will be million sellers.Other than that, I think that Starlick has a chance if it ends up being great, Crash also has a chance, and Overcooked 2 given the success of the first one on the Switch.Those are the ones that come to the top of my head now.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1