I think it has something to do with the TV show too. They are/were still holding open auditions for WWTBAM and Meridith Viera has 2 years (seasons) left on her contract. They film a seasons worth of shows in a few months.
Didn't they do the real show from the MGM studio too when in WDW (walk in and win week)? I think since the show maybe ending soon, there really isn't much interest or need in the studio anymore. I was in the audience for few shows a while back when Regis was doing the show (NYC). It took HOURS to do 1 show.
My DH auditioned for the show in NYC a few months ago. There were tons of people there and the questions were very difficult. There were hundreds of people taking the test at once, with more waiting (every 20 minutes). You either pass or fail. If you pass you then go into a "pool" for 2 years. So I guess this was the last of the auditions.
It's sad to see attractions go. I hope they put something really good there.