For how long will the 360 last until Microsoft makes another system

you just have to wait. my 360 is working well with great graphics, and from what i saw at e308, Microsoft dosent look worried about the hardware the 360 is using, so im guess atleast 4 more years, i googled it and one of the guys at Microsoft said the "720" isn't gonna make an appearance until atleast 2012 so ya im not worried and Microsoft isn't, maybe theyll have to put 360 games on 4 discs, not a chanc