Consider me an anecdote but I'm from the west coast and have never been to Universal Orlando, and have only been to USH a few times in 50 years (and Disneyland 50-75 times). I'm a Disney shareholder and lifelong Disney fan. But now I am a newly created Universal fan solely based on learning about Epic. I will be bringing my family of four to Epic and we'll stay at Helios and I'm looking forward to it, and so are my teenage boys.
(I will admit I knew nothing about this park until this spring, if that says anything about how much awareness it has had.)
But...we won't visit until '26 or even '27, because we want everything to be functioning, I want to be able to go to Epic for at least two days (plus one day each at other parks), and I want the initial crowds to die down. Now, if everyone is taking the same approach, I guess 2025 attendance could be artificially slow (I say "artificially" meaning the slowness is masking an actual stronger interest out there).
They could potentially accelerate business from people like me (i.e., move that trip up to late '25 or early '26) by guaranteeing they are capping attendance at some reasonable level, but I don't think I've heard anything about that (correct me if I'm wrong).