Splatoon 2 will hit it by the end of the year. Animal Crossing will probably release this year but will be at like 2 million end of year. Pokemon will probably come out when Splatoon is already at like 3.5 million.
A year from now though Splatoon will be over 3 million, Mario, Animal Crossing, Smash, and Mario Kart will all be over 2 million, and Pokemon the behemoth will be nearing launch.