What should be the reasonable lifespan of a console?

[StokedUp]

8 years. They cost a lot of money and they way I see it developers don't start fully using the hardware until it's been around for 3 years. So we then get 5 years of games that are using the console power at almost full capacity.
5 years is completely unacceptable and I personally think the developers would be pissed off aswell. Some games can take 2-3 years to make so that means a developer only gets to bring out 2 games.
Take Naughty Dog for instance, their only game for the ps4 has been Uncharted 4 as you can't count last of us Remaster and Uncharted collection as they were PS3 games. I'd like to see more of what they can do with the ps4.