So, I guess you thing that the Cats and Phantom runs on Broadway went too long (not to mention the many clones of the show around the country)? Many shows on Broadway run as long as they are making a profit. Classics and popular shows run long. Others have a very short run. If the two at Disney are still popular and filling the theaters, there would not be much incentive to take a risk on a new show that might not have the same draw. If the shows are not drawing the desired attendance numbers, then it becomes a much easier decision.
Not that I am against a change - just giving some other input into this discussion. I have no idea what attendance numbers the shows have, nor do I really care. I'm not a big fan of Broadway-style shows anyway... (never have seen Cats or Phantom, but I did see BatB once).