Consider this my "dislike" click. Just because you don't like them, doesn't mean that others don't. Even though I don't care for UoE at Epcot, I know others like it. That's enough to make me say to update the ride and keep it going instead of replacing it.
Not to mention, as others have said, folks that are older, younger, have health issues, etc., can't go on some of the rides at WDW. Having joined that club in the last few years, and my thrill ride days are now over, I look fore more sedate rides that don't bounce me around everywhere.
I agree that WDW doesn't need to be considered a museum. But, when I go to WDW, its like this 46 year old gets to recapture some of his childhood by going on rides that I first went on when I was a very little boy. It wouldn't be the same with out PoC, HoP, People Move, Liberty Belle, Country Bears, and many others.
IMHO, Disney needs to keep their older rides and just spruce them up (if necessary) when they get older. AND, they can open up more rides in addition to what they have. Not only does this cause people to spend extra days, and extra $$$, but it will also spread out the crowds much better.