Let me explain my prediction.
PS2> PSP=360> DS > PS3 or WII
PS2 because it is dyieng now.
I guess around 2009 we can call it officially dead.
PSP = 360. The PSP will have awesome next years with big games like GOW, FF:CC, KH etc.. Same for X360 so I guess around 2010-2011 PSP 2 will be released and the next Xbox will see a release .
PS3 and Wii will be not die before 2011 because PS3 will have a lot of games that are announced now that will release then and the Wii is a mystery for me...It depends what Nintendo do..Will they release new Zelda's, Mario's IP's?
What will third party do with the Wii? Will nintendo release a lot of games like Wii fit, Wii sports?