A couple questions/points:
1. Do the Brazilian groups really shoot up the attendance significantly? I know they're loud and obnoxious to the point of exaggerating their footprint, but do they even account for 1% of daily attendance in the summer?
2. I agree that Disney has worked hard to even out the crowds. Variable ticket pricing at different times of the year and the lack of "free dining" and other incentives may finally be diminishing the insanely crowded times of the year and shifting them to the less popular times.
3. I think the easy info all over the net and tripadvisor and everywhere else finally educated the public to go at less crowded times of the year. Weather and crowds are the biggest impediment to a great vacation, and people other than the WDW pros may now be wising up to it. Personally, I hate heat and I am hating crowds more and more as I get older. A 95 degree humid day in a crowded park is darn close to hell for me.
4. There is an insidious and violent under-current in America these days, and Orlando had two horrible events in June. I can't imagine any places with tragedies, including Dallas right now, doing well tourism-wise. People are wary, and Orlando and the Grand Floridian are not on the tops of anyone "must see" list right now. Couple that with higher prices and lower "free dining" type of incentives, and it's not a good picture. Yet, it will probably turn around soon.
5. The big new thing is the Frozen attraction in Norway, and many people, even little girls, are getting tired and Frozened out of the whole thing. Personally, I may wait until Avatarland and Star Wars land finally open up before coming down from Wisconsin again.
6. It's hard to wow people these days. Any brainstorm list of great new things would probably look silly in just 3 or 4 years. "Been there done that" isn't just a catchphrase, it defines today's vacation industry. How do you wow people in such times? And how do you keep them from staring at their phones for 5 minutes to actually engage in a real live attraction, event or activity? I just drove my family through the Alps, and I had to keep telling them to put down their gizmos and look at the amazing scenery. And my kids aren't even on Facebook.