With UOE,it's an okay ride with Ellen but I still have love for the original. Do any of the kids of this generation know who Bill Nye is? I was on the ride one day and a kid next to me asked his mom who the guy in the lab coat was like a hundred times.
That is the issue with using celebrities. Sadly many fans have come to expect it.
Attractions that use actors playing characters have more longevity. Great example is the Dinosaur pre-show. Felicia Rishad is in that, but those of us that remember the Cosby show aren't like hey that is Mrs Cosby!!!