People, as much as we all love CoP, it's a bit out of date. That's putting it kindly. When I go to WDW and bring people who have never seen it there, I feel embarrassed by how outdated and corny that last act is.
I know, I know. We can always just change the final act. But, if you do that, you're missing all those acts before the new final act that also need to be there in order to tell a complete story. You can't leave out the past 60 years because the 1960's as as important to progress as was the 2000's. You can't jump from the new age of electricity and skip the chapter of when we landed on the moon and, 30 years later, the advent of the Internet of the 90's and, twenty years after that, the digital revolution with smart phones and tablet PCs - ALL deserving of its own act.
The only we can can add more acts to CoP is by moving upward, as well as clockwise - I.e. spiral ala corkscrew. It wouldn't be CoP any more. It would be Spiral or Progress. After the fourth act, we would have spiraled up to the second floor. New acts could continuously get added, simply by adding new floors to the show building for every four acts that get added.
So, if we can't tell a complete and proper story, let's use this space for a story we can tell completely and properly that entertains, as well one that utilizes the latest story-telling technologies to do so!