Might this be indicative of something else in the works? A reduction in the number and/or length of circuit assemblies? If they are still having 2 two-day ones per year, they might be going to only one. If they are still two-day affairs, perhaps they are going to only one-day assemblies. Either way, it would open up time slots for the existing assembly halls to accommodate twice the number they used to. It's the same principle they've been using for KH consolidation—why not do the same with AHs?
Then the money grab would be in harmony with everything else they normally do. They are certainly not going to give it back!