Who knows, but something's pretty clear here: it won't do less than 500K either, a quantity that I was originally expecting. There's a push from Nintendo, including ads, showcasing of the game in events, demos, pre-order bonuses, etcetera. For this, I think it should do at least decently.
My bet with The_Liquid_Laser: I think the Switch won't surpass the PS2 as the best selling system of all time. If it does, I'll play a game of a list that The_Liquid_Laser will provide, I will have to play it for 50 hours or complete it, whatever comes first.