We've had this argument a million times. Yes if they could GET enough people like that a year. Every theme park would follow this same line. They can't and they know it. Even in lower seasons WITH APs the parks still gets much lower attendance.
And the reality is the APs are coming back, they are now being called 'memberships', right? So clearly they know they need to have APs of some kind. It may be more limited or restrictive though, we'll just have to see. But trust me, the second the crowds start dipping they will find all kinds of ways to get people coming back more. They been doing it for over 30 years now.
And again, people always miss the obvious: DCA! Even if DL can get filled without APs, I don't think DCA can and that is also the issue (that people oddly miss time and time again). Look at what is happening now with the reservations. DL is getting filled up, but DCA is wide open pretty much every day, including the first. The ONLY days you can't go to DCA is the first few days AC is suppose to open. But if you can't fill that park up like DL, then naturally they have to find ways to get people going to that park as well.