This is my thought too. People keep saying, "oh but the parks are still full so they're doing something right." NO. People are still coming DESPITE Disney's errors. They're coming out of pent up demand for travel, and out of pure HOPE that despite the issues, Disney will actually still be magic. People are coming and hoping to be proven wrong. I am going in a few weeks, and am hoping that myself.
The cliff will come once this initial surge dies down. Once the people who haven't been to Disney since pre-pandemic come back, and potentially see that things maybe aren't as great as they remember. Once, maybe, they HAVE been proven wrong and they see that their hope that things would still be wonderful has been displaced.
Now, I AM hoping to be proven wrong, and maybe I will be. But if enough people aren't convinced, yes, that cliff will be coming. It will be interesting to see how it plays out if or when that does occur.