At first, I thought you meant second fastest selling game. I thought to myself "IT BEAT GTA: SAN ANDREAS????!!!!" I just got off track. That was VERY good for mgs4. I hope Brawl matches it as well. (may beat it because of userbase.)
I really had hoped mgs4 had beaten Halo 3. I wanted it too so bad. (but, then again, there's Brawl and Gt5 to do that for us.)
Damn things have changed since 2009 began. Here are my new visions for the end of the generation.
Wii: 135 mil
Ps3: 85 mil
360: 60 mil