A 10 year lifespan is a function of consumer acceptance. Only winning consoles from any generation can be sure to achieve this, the PS3 is not the winning console.
There have been no substantiated rumours of any Xbox 360 replacement. Also statements from Microsoft directly contradict any idea that you can say that 2011 will be the year a new Xbox will be released. However there have been semi-substantiated rumours of an additional 4 hardware revisions which imply otherwise so with no evidence to support an earlier release and a little evidence to support a later release you'd have to go with the later release for now.
So in short, you have belief rather than proof or even evidence on your side.
If my belief is = to your belief then if I believe something to the opposite of what you believe does that not cancel it out?
Tease.
