I was so impressed by the exhibit/attraction and had a chance to talk with a very informative CM. He said it was originally designed to be a temporary exhibit and he didn't know how long it would remain. I said I would hate to see it go. He told me to stop by guest services/relations (whichever it is called) on my way out and let them know how I felt.
I'm not sure how much pull guests actually have (if any) on management's decisions when deciding if an attraction should stay or go. It can't hurt to let them know when you have really enjoyed something and would like to visit it again in the future.
I always try to speak to a manager or supervisor when I receive great customer service (when dining, shopping, speaking to a customer service rep, etc.). They are greatful to hear positive comments about an employee. I hope

my comments might help someone get a better score on their performance review, or a raise, or a promotion, or at least some kind of praise from their superiors. Sorry, got OT.
I do believe the CM, it probably was designed to be temporary. I agree w/ Dan, this could easily mean "semi-permanent". WDW, like any company, loves hearing positive feedback and wants to keep guest happy. Everyone appreciates a pat on the back for a job well done. If you want it to stay, be sure to let them know!