Something to consider regarding longevity expectations for things like capacitors would be the input tolerances they're designed for. In many cases the capacitors that fail don't fail because they have reached the end of their physical life. Instead the manufacturer chose a component that could only handle the lowest nominal load not accounting for things spikes in electrical input due to normal power system anomalies.
A number of years ago I pulled an otherwise perfectly good Samsung 46" TV out of the dumpster. While researching how to fix it I found that if they had simply installed higher rated capacitors to begin with, the TV would not have stopped working.