Switch is super impressive and Pokemon isn't even here yet. Maybe has a shot at 5m for the year in Japan.
I think 5 million is a tough goal, I would say 4.5 million is more likely.
Using Famitsu numbers
Hitting 5m would require 2.5m this quarter which is more than 3DS ever did.
When the herd loses its way, the shepard must kill the bull that leads them astray.