The OP and others seem to be trying to paint a picture that WDW is falling into the swamp and that attendance has dropped 10%, not just the mere 1% that was recently divulged. This just sounds overly dramatic to me. While I agree that WDW needs some TLC, I hardly think it's time to sound the alarms. If I had to guess, I would say that 1% is attributable to people shaving a day off their trip to WDW to go and see Harry Potter at Universal.
I happen to think it's a good thing that HP is such a big hit for Universal, they needed something like this. But, I think it's a good thing for Disney and the other parks in the area as well. It's called competition, and it's a good thing. It keeps everybody on their toes, innovating and trying to come up with new ideas to get people to come back and visit. Regardless of what the most recent numbers say, Disney is hardly hurting. We were there in early October and found the parks to be the most crowded we've ever seen during this time of year. And, in case you haven't noticed, they are doing something in Fantasyland that looks pretty big, plus Star Tours is closed for a MAJOR overhaul. So, while Universal has succeeded in this round, I think that when Star Tours 2.0 opens and then the new Fantasyland begins opening, that 1% will come back.
All this isn't to say that I don't think there's more room for improvement, because I believe there's lots that can be done. Knowing Disney, they're not sitting idle and crying about getting beaten by Uni. No, they're continuing to do what they've always done, create, innovate, and find new ways to entertain and make money.