I tend to agree, but I know it's not the prevailing opinion here. I mean, I think parades should be kept in good condition while running, so that may mean updating floats or replacing on occasion, but I personally don't see parades as something that "has" to change regularly.
To be fair, we tend to only visit every few years and don't always watch the day parades so that affects my prospective.
I do find it interesting that people rail against "classic" attractions closing/changing but don't have the same kind of sentiment with parades or other entertainment. To me, for example, the MSEP is every bit a "classic" Disney offering on par with CBJ or the Tiki Bears and I think losing that forever would be just as heartbreaking as losing Grizzly Hall. YMMV