It probably depends on the model. Many people still have working K1's, my K2 is one of the early US only models, and it's still going strong, but who knows. I have a sneaky suspicion that newer models aren't built with the same care that the older ones were. The K3 just doesn't feel as "sturdy" as the previous model and etc.... Price of popularity and miniaturization I guess.
NOTE: I realize that the above post can be easily interpreted as an "Older is Better" type of mantra, but that's not how it was really intended. I was aiming for more of a "Newer is More Disposable" mantra, actually.