To gain many years from a camera is not unreasonable or unexpected.

The shutter mechanism is generally rated for a certain number of actuations, much like a hard disk's MTBF (mean time between failures).

The shutter could fail well before that, or fail after many actuations after that rated number, and it could take years to do so.

The problem with digital cameras these days is not the quality of parts of expected lifecycles before something fails, but obsolescence!

Having said that, replacing a part in a digital camera can be prohibitively expensive, and depending on the age of the camera, it's sometimes more economical to buy a new model for marginally more money than spend a motza replacing parts for an EOL model.