Is the K-5 a ten-year camera?

After about 2 years, the shutter began acting up on my k100d. So I wouldn't be surprised if simple silly things like the control buttons fail before the shutter.

10 years represents a lot of progress. Don't romanticize your current gadget. It's not worthy and is not a Leica M3 or a Pentax k1000 (which is really just a cheap consumer camera after all).