In this case, I'm actually glad to hear this happening. (Not the Club 33 part, but that it won't be at MK). MK isn't huge, and needs every square foot it can get as places average guests can occupy. I would hate to see, for instance, space carved out of the upcoming Adventureland restaurant or elsewhere in MK when those spaces could be used to hold average guests, and especially when the park is practically bursting at the seams.
Compare that to Epcot or even DHS, which both have plenty of dead space everywhere. Epcot has plenty of underutilized space, including lounges which haven't accommodated ride sponsors in years (Land and Imagination lounges both just holding a few managers' desks, for instance). Even DHS has some odd spots, like the upstairs of Brown Derby, which are hardly used to their full potential anymore.