For people saying "maybe 10 million".......... i hope they are joking.

Do those people realize that not even the worst selling REMAKE is going to sell under 12 million?

I think it will sell aropund 15m, wich is amazing for a console that is slowly losing popularity but there is a chance that Pokemon Go make the sales go nuts and gets 20m.

Averaging 15mil for main entrys.  :p

It would be interesting if GF could add some kind of last minute feature between Sun/Moon and Go. Though I don't know what that would be exactly.

Personally, I don't think so.
If Diamond/Pearl and Black/White couldn't do it on the DS, the greatest selling handheld in history and 2nd greatest selling system of all-time behind the PS2, I have seriously strong doubts Sun/Moon can do it on the 3DS, especially considering X/Y won't do it either.
GO will give it a considerable boost, though because of how massively popular that game is, I'll even predict that because of GO, Sun/Moon sales will surpass both Black/White and X/Y, maaaaaaybe, just maybe it'll get close to or reach Diamond/Pearl, but by that point the 3DS will be long since dead, the insane hype and popularity of GO will have died down and Generation 8 will be on the way for NX (assuming Nintendo doesn't make another handheld.)

I don't know 20 millions seems too much if it is only on 3DS. However I think soon or later main pokemon games will start to come on mobile from there 20 millions will be quite small.

With Pokemon Go being such a huge success I can see Sun and Moon doing 20m TBH. I mean, X and Y is over 15m right? Like official numbers?

It should at least sell better than D/P. I hope it does anyways.

and guys really. Please stop taking install base into account here. Install base and attach rate vary from console to console. If we are talking how much will be sold by how many consoles have been sold, then that would mean D/P and B/W should have done over 30m. Taking that into account, X/Y has sold better than B/W (I think) including digital on the 3DS with 1/3 of the install bass of the DS. It's only 3m away from D/P. Like really. Install base is not gonna hurt the sales of Sun and Moon.

if release on nx then yes

I think it will reach 15M :)
But will not pass 16M u.u

It's possible, but probably not...