The Fascinate is a great phone and I never have any issue with it. Of course, it can last a few more years if I want to. This is the same thing as car. After you pay off your car, if it is properly maintained, it will last a few more years...easily over 150,000 miles. But the problem is not because the car is failing you but people tend to like new thing. That's why we buy new car and we buy new clothes, and not to wear the same clothes for the last 5 years.
As much as I love my Fascinate, I am considering to upgrade to Galaxy Nexus.