I agree. Just wanted to point out that it isn't just Disney World...it's the bulk of the entertainment and travel industry. That's an important piece of the "why".
The same thing for the 90s and early 2000s.. yes WDW grew tremendously, but so did every other theme park and amusement park in America..and overseas. It was a huge time for that industry in general.
ETA- it just isn't an accurate comparison to compare to Disney to itself. I see people do it all of the time, but there are so many other factors to consider outside of WDW. Looking at the overall industry is just as important.
Right/ push-pull. Along those same lines, I think it's important to keep in mind that Disney isn't just following the consumer or industry trends, they set them, because they are the market leader and a major (if not 'the' major) tourist destination for the eastern half of the US.