Yes, MK hit capacity on the 4th.
I don't think the Harry Potter thing will be big for long, it's a trend that's huge now yes, but so was Pokemon and many other fads, it'll die eventually, and Disney did plan for this, look at all the expanding they are doing, Fantasyland in WDW, Disney Cruise Line, Disneyland, Disneyland Hong Kong, etc. I was there for the weekend (July 1-5) and it was good crowds, busy on the 4th of course, and MK seemed to have a good crowd on the 3rd, especially when everyone left after the fireworks!
Just back from two weeks at the world, 28th june to 10th july and the crowds were certainly down on what they have been the last few years. MK on the 3rd from 6pm till after the fireworks was reallly quiet, not even the constant light rain could account for that. EPCOT on the 4th was also quieter than normal, and from talking to a CM we know rather well, attendance was much lower than predicted.
We were speaking to a few people at times and both said they were never normally there in July, and reading up, expected there to be larger crowds but were a lot lower than what they expected.
I wish they would just release the actual numbers so we could have real evidence since there are completely conflicting reports.
According two these two posts MK hit capacity, yet the crowd was less than expected. I'm not saying anyone is wrong or lying, I just think perception is a big part of things even for CM's.
I haven't been down this summer, but I do know that the resort rooms at WDW are filling pretty well to the point when I was considering an impromptu trip over the 4th there was a very small selection of rooms, especially at the value level.
If there is a lull, there are way too many factors to blame than just Harry. The economy, weather, and oil spill are all affecting travel especially to Florida. I am sure Harry has had an affect, but I'm not sure what it is. Does Harry take days away from WDW? Probably? But does he bring more people to Central Florida? Probably. Do some of those people end up at WDW for a few days? Probably.
Is Harry the big thing right now? Absolutely. Will that fade? Absolutely. Will it continue to be a draw years from now? Absolutely. Is it going to close down WDW? Absolutely not. Will it prompt Disney to make huge changes? Maybe, maybe not, I'm sure many new attractions will be opening in the next 5 years but are these directly because of Harry, or just part of the natural progression of things?
Finally, if the huge crowds at Harry do prompt Disney to make something huge happen, we won't see it for some time. If they started planning something really big today I think an optimistic opening is 2 to 3 years away. If they just push something they already have in the pipeline forward that might be sped up, but if they broke ground today on a huge new E-ticket the Harry-mania would already be waning by the soft opening.
It's better that they take their time, use their initiative, and creativity, to build something great rather than just react.