It wont but itll be part of what keeps the 360s momentum going until early next year.
Halo + ODST bundle will get some PS3 and Wii owners in, Halo 3 is simply a beast and you can bet many new 360 buys buy the system for it.
Forza will again wont directly help hardware, but itll give it a shot in the arm for the holiday in Europe, a region that MS have always massively struggled, the game will be crucial for the remainder of the year to keep European interest.
As for GTA Episodes pack, similarly itll be a part of that momentum that will carry the 360 through to the end of the year.
As somebody said, MS simply cannot compete toe-to-toe with Sony. They have a bigger brand and more exclusives coming out as well as hardware that offers more value. Natal is going to go a long way for the 360 surviving the rest of the gen.
