So here is the thing with the attendance numbers. It hasn't changed much, Magic Kingdom is still the park that is carrying the weight for WDW. Disneyland is the one out west. But man, you take away the two flagship parks and it is even steven for 2023.
Magic Kingdom - 17.72 million
Disneyland - 17.25
Epcot - 11.98
DHS - 10.30
Islands of Adventure - 10.00
California Adventure - 10.00
Universal Studios - 9.75
Universal Hollywood - 9.66
Animal Kingdom - 8.77
Then a big drop as the #10 spot is Sea World Orlando at 4.34 million. So I would say they don't have to worry about that.
But as for Disney, is that comforting? It is basically a coin flip if you remove Disneyland and Magic Kingdom from each coast. Universal is just as popular on both coasts as the remaining Disney parks.
Here is where I would be concerned if I were in Disney's shoes. The 2023 might make them relax, but it shouldn't. Because just for fun check out the 2009 attendance figures:
Magic Kingdom - 17.23 million
Disneyland - 15.9
Epcot - 10.9
DHS - 9.7
Animal Kingdom - 9.59
California Adventure - 6.09
Sea World - 5.80
Universal Studios Florida - 5.53
Islands of Adventure - 4.62
Universal Studios Hollywood - 4.30
And this follows with the usual parks getting 4 million or less after this.
So when people said back in 2009 (and I remember) "Oh once the Potter expansion happens Disney needs to be worried", well..................do the math yourself. Nothing has changed in 15 years for the Disney parks, all three Universal parks have doubled. The saving grace is Disneyland and Magic Kingdom, and they practically trip over themselves changing it up to be something that they think the fans want. But they gut Splash Mountain, take the charm out of the parks with other things like gutting Tom Sawyer Island, and turn classic rides into meet and greets. People go to those parks because they are different than the rest, they do not want them to be like the rest, that's the point. So yeah, I'd be worried now if I were Disney. Universal has closed in on them A LOT in 15 years and their castle parks that they can't leave alone are what keeps them #1.