Maybe Fantasmic didn't have every performance filled to capacity but it was still a very popular show. I think there's a more dangerous attitude going on in the minds of Disney execs. these days. It seems that whenever something is popular, Disney wants to get a piece of it whether Disney created it or not.
I've never been into AI and I had a "Jimmy Crack Corn, and ...." reaction to the announcement of an American Idol Attraction. Why build this attraction simply just because American Idol is very popular nowadays? I think that's frankly a stupid attitude for Disney Execs. to have. When Walt built Disneyland in 1955, do you think he considered building an "I Love Lucy" or a "Jackie Gleason" attraction? Did we have an "All in the Family" or "Marcus Welby MD" ride when WDW opened?
Right now "American Idol" is very popular. A few years ago "Who Wants to be a Millionaire" was huge. Disney built an attraction on that show. When the shows popularity waned, the attraction was gone.
I think it's a big mistake to base attractions on what's popular. With that attitude Disney will never build anything with the idea of permanentness. Everything they build will be temporary. You can't buy "Song of the South" in U.S. stores. The "Twilight Zone" is no longer on T.V. Why do we still have Disney attractions based on these "has beens"? Because they're great attractions, that's why. If Disney execs. really wanted to do something that satisfied the public, they should have the attitude of "let's build something great!" not "let's build something.....well....what's popular these days?"