Never revamped Spiderman? They just changed his costume/nature of his powers. I say that's a pretty big change. Every character goes through drastic changes, but eventually returns to their roots.
Oh, I would say Superman. Spiderman is popular, but outside of comics, he has trouble holding his own show. He had his own series for a couple of years and was followed by Spiderman Unlimited and was cancelled. After the second movie, he had another show on MTV and it still got cancelled. Superman had 4 movies, a live action show, S:TAS, Adventures of Batman and Superman, Justice League and JLU, and Smallville. Plus, he has another movie coming out.
Seriously, you have to be pretty interesting to mantain things like that. Superman isn't even close to dying out, yet.