Yep. I'm fairly certain of it.
I see MKWii becomming the best selling console game in PAL ever (8.64M), and perhaps comming close to 10M in a few years - for beating Nintendogs as best selling ever, it has no change though.
So 9-10M for PAL
It already has 1.65M in Japan, and should end at 2.5M or something, perhaps slightly less. 2-3M lifetime.
In Americas, it has sold 2.8M. I see it ending in the 5.5-6.5M range when all is said and done.
So overall, I see it like this:
Area / Low end / High end
PAL / 9M / 10M
Japan / 2M / 3M
Americas / 5.5M / 6.5M
Worldwide / 17M / 20M
So to answer the OP - yes, I see it beating GT3 with ease, as a matter of fact - it could beat every Ps2 game.
It could become the best selling 3D, non sim, game ever.
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS










