You're five years into the Xbox 360 lifecycle. That's typically when consoles start their sunset and new hardware rises. But in the case of the Xbox 360, don't expect a new console anytime soon. According to Aaron Greenberg, Director of Product Management for Xbox 360 and Xbox Live, Natal substitutes the need for an Xbox 360 sequel.
When asked directly if Natal is replacing a new console, Greenberg smiled and offered, "We don't think we're halfway through this generation." Pressed further about if Natal means Microsoft will not release a new console anytime soon, Greenberg said, "I would say so, absolutely. It will extend the life of this console."