Voted 12.5-15mil.
While it's no Mario, it is a big 3D Nintendo platformer coming out at a time when there is literally not a single other big new one-player game on the system and won't be for several months. For the probably 7 or 8 million people who have/will buy the S2 in the first 4 months, it's the only big new single-player AAA game available for purchase. And Nintendo definitely put major effort into it to try to make it a top shelf platformer companion series alongside Mario.
I have no idea how great it will end up being, personally I haven't been very interested in DK platformers since the original SNES DKC games, but the fact that Nintendo clearly gave it the first rate 'Mario' treatment and the fact that it's gonna have several months as the only major single player game out on the system for several months when millions of people are gonna be looking around for what else to do with their S2 besides play Mario Kart World or old Switch games, it definitely has a good chance to rack up a bunch of millions of sales in this initial several month dry period for the system.
If it ends up being a classic and very well received game I could see it hitting 20m. But I'd say 10m is absolute guaranteed regardless of quality (like even if it was the bloated mediocre mess that DK64 was, which still sold well off of nothing but hype) since Nintendo basically set things up so that it's the only big new solo game to play for a long time on the system.







