Most of the APs are blocked out for the absolute busiest days. I'd be curious to know what percentage of people in a park on an average (pre-COVID) day were passholders.
Certainly the least profitable guest is a passholder who lives within 30 minutes of WDW and pops in for a few hours frequently to ride the major attractions and doesn't purchase food or merchandise. I just don't know how many of those there are.
I live over 3 hours away and use my pass 9-12 days a year. Partially due to the free parking, it comes out cheaper than the equivalent in day passes, especially with park hopping. On the days that I visit, I almost always make some kind of in park purchase of food or merchandise or both. I'd be perfectly fine if, for the same cost, there was a maximum number of days I could go as long as the maximum is reasonable like 20 or so.
I'd personally prefer a limit to the park pass system so that I can be more spontaneous and decide that I want to take a trip two days from now but park pass isn't a deal breaker.
What will be a deal breaker is if they create a paid FP system which bogs down the standby lines to the point that if I don't pay what is essentially an admission surcharge I have to wait in barely moving, 1-3 hour lines for every major attraction.
If they limit the new FP to 20% or less of the attraction capacity (and charge a lot for it) so that the standby lines move continuously, then I'll be somewhat OK with