Probablly not for a little while longer anyway. The kinect certainly is not going to last them another 5 years. But perhaps another year to a year and a half.
I smell it coming soon. Give or take it gets announced it's in early development this E3.
If they weren't busy waisting money on a dying system they could be paying attention to actually making a new console. I suspect the PS4 to be out in about two years or so. Maybe earlier if the other companies decide to pump out consoles faster.
The verdict: Hopefully Microsoft won't rush there next console like they did with the 360,Nintendo will actually add a HDD to there system with better graphics instead of going cheap. And sony will stop sueing everyone.