People thought I was tweekin when I said Splatoon could be THE defining sw for Wii U. Im telling you, if this game gets the proper advertising, as well as demo stations it could be a system seller. I played the game with a CODudebroPCelitist yesterday, and while he made fun of me (lol) and the game at first, I made him try it and an hour later, dude said "not gonna lie, this s*it is legit fun".
Don't know about 3 mil, but it has a good chance of hitting over 1 mil.