@Fei-Hung: DVD will continue to be the standard for both the 360 and the Wii. They may get, at most, an add-on to watch Blu-Ray movies similar to the 360 HD-DVD add-on (although I heavily doubt that would happen in the Wii case).
Just wait a few years and you'll see, that's all I can tell you.
My Mario Kart Wii friend code: 2707-1866-0957