I'm surprised so many are in favor of this considering how often people get upset at changes similar to this. That said, I really like it, especially with the concept being they are going to discuss historical events in muppet ways.
I think that perhaps it's easier because we're not really losing anything - they're not replacing an existing attraction. When the show is not on, I imagine the area will look almost exactly as it does now. I think that makes it easier to swallow. You're absolutely right though - it's usually a safe bet that there will be some vehement opposition to pretty much any changes made.