Is it possible for the Wii to have games like Bioshock, MSG 4, and GTA 4?

[OooSnap]

Hypothetically, would the Wii be able to have such games, albeit with downgraded graphics of course, without drastically changing the game?

I ask because I read somewhere that COD 5 will be essentially the same game on the Wii as is on the HD consoles. I am thinking how is that going to work.