I wouldn't bet on PS3
The Wii device incorporates next-generation technology that hasn't even begun to be fully elaborated upon, including the ability to immerse the user into a moving frame of reference and other modes of virtual reality that are both engaging and practical in implementation: http://wiihacks.blogspot.com/
By the time PS3 gets its act together -- in what? THREE YEARS?? -- Nintendo will have a second generation Wii with some kind of cheaper HD disc playing capability.