The poll at the top of this thread... gosh. That's probably the most vague and hard-to-answer poll I've ever seen. Of course I'd want change, as everyone here should. But I'd want good change.
Not sure how I'd rank the Nemo ride among the others in the park (I don't know that I'd say it's the worst) but I think it's far better than what it replaced. The Nemo ride tells a story. The previous ride would tell what's on floor two. Also
@Goofyernmost , it's far from the shortest ride, perhaps you were joking?
But I'd never thought about the downside that you point out, and I agree. Though while that may be the biggest factor, I'm sure it isn't the only responsible for this change in guest behavior. The kid-to-adult ratio is higher than it was back when the park opened, people may have shorter attention spans, people (including me) have negative views of aquariums, etc.
And finally, on the "should be treated by Disney as it's own attraction" part, I don't see what Disney can do. What do you suggest?