I have seen the parks...likely many more times than you.Have you seen the parks? They are unbearably crowded at least 330 days of the year. If they had another park it would space people out. When we go on vacation with her, my grandma has to run over hundreds of people on her motorized tiger.
I have tracked their crowd swells for over 20 years...
I used to watch their money and work logistics
And I can tell you that they aren’t anywhere close to “packed” enough for new parks.
It has nothing to do with crowds: it’s about capital expenditure, labor and overhead cost, markets available and longterm return on investment.