Uh...PS2 is not a "next generation console". Hell, it's inferior to a P2-266 Klamath with a Voodoo 2 board.
There are 30 million PS2 owners and guess what? Those are the same 30 million AOL users. That should tell you something right there. No, really.
Halo can do well next year, and will look quite good next year since it already utilizes features such as bump mapping, but it would be a mistake to sell the game on the PC platform in its current form next year.