Pokemon? No. I think 20 million is a possibility, though.
Animal Crossing? Very good chance.
Metroid Prime 4? Eh, maybe.

idk about AC or Metroid, but no way in hell for Pokemon.

Pokemon has big shoes to fit, there... Seems unlikely. Better than last generation, certainly, but not THAT high.

I agree.  When HD Pokemon comes out on the Switch it's going to be a rallying call to every person who has ever have played Pokemon or has ever heard of Pokemon to buy a Switch and play it.  Just the buzz around it is going to get a ton of people who don't even care about Pokemon to cave and buy it.

It's going to be the same with Metroid Prime 4 and Animal Crossing; having both in HD alone is going to create a lot of interest from people who may not have been interested otherwise. 

I assume for all three titles, that they are good games with good general scores. If they arew bad entries, the legs will be bad and the game will fall short.

I start with Prime 4, as this seems the easiest guess. If the game is good as stated above it should be easily outsell any previous entry. Prime was on the GC, with a userbase that Switch will clearly increase upon. Even better, the Switch base includes core gamers, that also got Doom, Skyrim and other core games. Switch also attracted Core gamers that usually avoid Nintendo platforms. So for many it's the first possibility to try a Metroid game. It should easily go past 3M, with luck and a really good game it could break 5M.

Animal Crossing is a bit more difficult. But as you said, the 10M mark should be possible in any case. I don't know too much, but I just assume it can beat the previous entries, if the game is no failure and the surroundings are quite right.

Pokemon could be a problem. Not only is Red/Blue massive, there are more problems. So far Pokemon was on relatively inexpensive handhelds and had moderate handehld game prices. Both goes up. As a big portion (not all, but a significant portion) of the Pokemon gamers are kids, I see problems here. So far I don't see parents giving Switches to kids. So that might be a problem. Maybe that changes with Labo, but that is yet to be seen.

On the other hand a Pokemon on the Switch could be a massive step-up. The better graphics, improved gameplay and playing on the TV could bring back old fans that gave up on the series.

So I'm a bit torn about Pokemon. Currently I would conservatively assume it falls short of the goal, but that stance might change if we learn more about the development of the Switch and the new Pokemon game.

If Metroid Prime 4 gets a metascore over 80/85 I can guarantee you that it'll become the best selling game in the Metroid franchise, it's been so long since the last Metroid Prime that this will be like a brand new IP and find new fans, plus Nintendo seems to have their marketing working properly for the Switch titles.

Animal Crossing similarly I think is very likely, there's A LOT of hunger for Animal Crossing among Switch owners and people who are on the fence, Japan will singlehandedly buy like 5M units of the game, it's the biggest IP there.

Pokémon I'm gona say no, 32M is just too much, yes, the Switch has very high atach rates, but it still has a somewhat small install base, when the console gets to 30/40M I can assure you that the atach rates will start dropping, unless the Switch sells like 160M LT and this Pokémon title isn't followed until like 3 years later by another Pokémon game it won't sell that much

My brain says "No, probably and definitely". In that order.

But my brain usually underestimates Nintendo, so I'll go with possibly, very likely and absolutely.

That's kind of setting the bar low since 3D Zelda, Mario and Metroid are essentially Nintendo's holy trinity when it comes to well reviewed games. Metroid Prime 4 getting something like an 80-85 on metacritic when every game in the Prime series has reviewed over 90 would actually be a warning flag that it might be a sub-par game.

Pokemon Switch definitely won't beat out the best selling Pokemon

Animal Crossing? Maybe

It's honestly strange that Metroid Prime 4 is the game people are debating on in comparison to Animal Crossing ... Metroid Prime 4 is without a doubt, going to be the best selling Metroid, bar none.

I know but it's been so long since the last Metroid Prime that there's the possibility reviewers might not enjoy as much the previous titles, I don't know, maybe they got used to different shooters or maybe they'll introduce some weird mechanic that won't appeal to everyone, I just think it'll be hard to break the 90+ Metascore nowdays despite all of Nintendo and Bandai's efforts, besides Xeno 2 is also the lowest rated Xenoblade (albeit only one point shy of XCX) and yet it already outsold the rest of the series, Metroid could do the same