Rol is the winner yet again
That wasn't really a post of agreement, but rather encouragement that it's fine to be optimistic about Switch. Your prediction will most likely end up wrong because there are still 2m to go with only two months left. Sure, the 3DS punched in 1.2m over the course of only three weeks, but that will be tough to repeat because the Switch already has all its important games out for this year while the 3DS had a triple punch of high profile software in 2011's final two months.
Switch beating Wii U's lifetime sales in Japan (~3.5m, I think) by year's end is doable though.