Will another Halo game ever sell 10 million again?

[badgenome]

Gabriel84 said:

Who knows, depends on how good the game turns out to be.

I think halo reach stands a better chance than GT5 to hit 10 million.

It's an interesting comparison. As the OP says, if/when Halo 4 comes out, the people who were 16 when they bought Halo: CE will probably be in their late 20s. When GT5 finally comes out, the 16 year olds who originally bought GT5:P will be in their late 30s/early 40s.