Not so sure that this will have the same legs as REVII, unless it gets its own gold edition.
With that said, I think it will fall a bit short of 10 million.

Unless Capcom start porting it to future gens like they are doing with RE4;5 and 6.

How much did RE7 sell at this point after launch?

I have to imagine the majority of those that planned to get it bought it at launch or bought it cheap around the holidays. Black Friday deals in America had it at $19.99 at quite a few stores. I'd imagine another few millions in sales.
bonus question. It's a fantastic game, great visuals, tough at times, great 3D audio especially in the first two castle/houses. Not too scary compared to other Resident Evils except for one section which is quite terrifying. Not my favorite in the series by any means, but a great entry. Now if they want to add a vr mode into the Playstation VR2 I'll rate it higher among the series greats.