I think that the difference between IASW and CoP is that IASW is more like a traditional ride and people will line up for that. IASW can actually get a line.
CoP is still a walk on even when the PeopleMover has a line. I don't think it resonates with the younger generations and, if anyone, I should be one of those championing it to stay but it really doesn't resonate with me, either (44yo here and grew up with this stuff). It really just isn't a good attraction any longer. It literally doesn't attract people, except in really small numbers and that is mostly nostalgia.
I know someone is going to chime in with something like, "Well, my 7yo little girl LOVE CoP," and I think that's great. The problem is, where are all the other little boys and girls or even parents? They're not lining up.
I think people fall into the trap of, "Walt touched it so it's holy." CoP was a neat attraction but I really think it's run it's course. I remember when I first rode it how cool it was that the seating area spun around the stage. I thought, "That's ingenious!"
I thought the same thing about Universe of Energy. "Whoa! The freaking audience is being moved around! How cool is that!" That one, too, has run it's course. I think that they need to gut the building and come up with something new.
They probably won't take it out because there would be an uproar from those who like it but don't actually ride it. Let's just hope that if they do take it out that they don't "Rocket Rod" it in some way and build an attraction on a silly budget that doesn't work and is down most of the time and then abandoned.