Didn't I read that the main actor from CoP died a few years back? So if you changed the last scene, you'd basically have to redo the entire soundtrack so the voice matched. Unless you could get an impersonator or something, I don't know...
CoP is one of my favorite rides in WDW, yet even I can see it needs serious help. I'll ride it as long as it's open, and if it went to Epcot or a museum I'd still ride it. But...
What people forget is that the attractions in WDW were created to inspire and amaze. Audio-Animatronics like the Hall of Presidents and CoP were very innovative and dramatic when they were introduced. Think about that. The Hall of Presidents had people gasping and open-mouthed.
Today, we've all seen Audio-Animatronics, but we can still be amazed and/or inspired by how they are used. The Yeti is a good example... I recently rode EE for the first time, and he just blew me away!
I'm sure Walt wouldn't be happy seeing the CoP rotating 1/4 full and see the people come out yawning. I'd love to see them take the basic concept and start over with the most modern, innovative technology. You had CoP in the 60s, Horizons in the 80s, and a new ride in the 00's, all designed to inspire and amaze based on Walt's original vision of "progress".