If Metroid Prime 4 is indeed Switch 2's title launch game, I imagine Nintendo is putting all its effort to make it blow people's mind away. I expect it sells more than any Metroid game yet and be successfull. Not as the same level of a Mario or Zelda game but still a success. Let's not forget 2017 saw a bunch of heavy-hitter game realeases, so it's not like the Switch 2 would rely only on Metroid Prime 4 to be a success console