It could be that bumping the variety acts from the Walt Disney Theater to a lounge act status saves Disney a ton of money. Also, whatever was going on in the smaller venues is no longer required as the variety acts now fill that space while the CM's under contract have to perform twice as many shows in the WD Theater each cruise (bet they love that

). I've been on cruises where they offered matinees for a show they thought would be extra popular. Eliminating the matinees definitely reduces staffing needs.
At the end of the day, I just don't buy the Cruise Director's story that this is a theater capacity problem. As I said before, the Walt Disney Theater didn't just suddenly shrink, nor did Disney add a whole bunch of new cabins. For nearly twenty years, the theater capacity has been perfectly fine. As much as folks like to come on these board and fuss about things, I don't recall a hoard of complaints about not being able to find a seat at the shows. I simply do not buy the story that Disney is selling here. If you do, fine. Knock yourself out. To each their own.