PlayStation 4's Lead Architect Mark Cerny feels that the PS4 will live long and prosperous in our home theaters, as he explained as part of an interview on Digital Spy.

When asked if the PS4 would last ten years like the estimated life cycle of the PS3 he explained:

We definitely think long-term. It's not that you can sit down and say "this hardware is lasting eight years" or "this hardware is lasting twelve years", but we definitely think we've put in a rich feature set in PlayStation 4, that will result in some excellent longevity for the console.

That's pretty promising, and Cerny definitely looks more of a realist than his predecessors, that artificially assigned the PS3 a precise life cycle. That's quite refreshing in its own right.