I mean it's not unthinkable that new visitors will visit as much as current visitors.
Only if they can create loyalists like they did before. Those aren't just 'visitors' -- Those are full on converts who not just buy a product, but are integrated with it. Lifestyle, life choices, etc.
Point is, it's not a 1:1 replacement to say "your spot will be taken by someone else". It takes getting many customers to replace a single loyalist because the loyalist is coming so often, and spending in other synergist ways too.
So imagine facing the world of.. "We are finding it difficult to recruit 5% new customers..." "Well, you gotta do better, because you really need 20% new customers.. every year"
This is why repeat loyalty is so valuable and every business focuses so much on satisfaction because return customers are cheaper to get.
This is my take. I think Disney gets locked into an un-winnable situation with fans here. The idea is that they are supposed to make park prices cheaper so that lots of families can attend, with the assumption that today's children will fall in love with Disney like Boomers and Millennials did. And yet parks are already too crowded, and fans want lots of expensive updates and high tech new rides each year, which cost quite a bit, and the highest level of 1970's-reminiscent service.
The negative impacts from crowds can be managed in other ways.. Modern Disney has used it as an excuse to use pricing as a way to deter and shape demand. The Disney of 1970s used crowds as the justification to work out how to increase their park capacity and reduce the negative impacts of long waits.
The pressure to deliver non-stop leads companies to focus on short term vs broader fixes.
There's also a sentiment of "No updating parks to include things that weird Gen Alpha actually likes because ew." (That sounds critical but honestly I kind of agree with the sentiment - I want Gen Alpha to fall in love with Disney but I simultaneously do not want Disney to become the hyperkinetic, meme filled digital experience that Gen Alpha seems to favor. Oh, also with random building blocks, Gen Alpha can't get enough of building random stuff with blocks, be they real or digital. They crave the highest tech in the world so that they can essentially build with Duplos, it's the weirdest thing.)
But this isn't new either.. Eisner forced the company to look beyond it's stale and aging profile to collaborate with others and break old stereotypes. Iger made the company a conglomerate of brands.
Change is always disruptive and not always welcomed by all - but if done WELL, it tends to grow on people and win out in the end. The difficult part for the company is to predict the kind of entertainment that will remain appealing to both new and old.. and that's what separates the creators from the copy-cats. Challenge is, Disney's track record here in recent times is pretty spotty.
I'm not sure where you fall on any of this, but my thought is there has to be compromise. If people really want the next generation to love Disney, they may have to tolerate some of that Gen Alpha ADHD Thinking Style in the parks. If not, they can enjoy classic, nostalgic Disney which I love, but with the realization that this may be more niche with the next generation. If people really want tickets to be less expensive there may need to be a realization that there's a tradeoff between ticket prices and crowds, as well as ticket prices and spending on the parks. And yes, I understand that Disney could spend more on the parks and not go bankrupt, of course - but it's also reality that they are working in a capitalistic framework, they are not a nonprofit. So the need for those margins to remain large is what it is, and that's not changing, as much as I as a park goer would like them to just put 80% of the extra back into the parks.
There are trends.. and there are specific implementations. Supporting a trend like interactivity, and getting an implementation like Sorcerors of the Magic Kingdom.. is an example of embracing change. Supporting digital experiences.. and getting app based queue elements is an example of embracing change. Shifting food options.. is an example of embracing change.
I don't lump punitive pricing strategies or monetizing demand in with those same kinds of lines of thought. "its busy, so prices had to go up" is overly simplistic rationalization and isn't the only option. It's one of the easist, and logical, but it is not the only way for a business to operate.