That could happen now. I'm not at WDW, but could book FP+ because I had a reservation at the beginning of the month.
Also, do you have any idea what a pain in the butt those kiosks are? Sorry, but if I'm paying that much for a pass, I want early access. They will probably figure out ways to restrict it. They can make it so it's 30 days out instead of 60.
But 30 days out from what? If you don't have a reservation, there's no benchmark to start that timer.
I've been an AP holder, off and on, and I completely agree with what you're saying. AP holders are the most loyal guests. BUT, because they've invented this system, they've also invented some new problems and have taken away perks from all guests - both day and annual.
For example, I pay for park-hoppers, but I can't get a FP in more than one park now. I also can't repeat major attractions in the same day like we were able to before with legacy FP. We've all lost out, while also gaining perks like being able to ride TSMM without being there for rope drop.
But you have to think about this logically. Let's pretend there are 1,000 AP holders (there are WAY more, but I'm keeping this simple). If all of them have the "privilege" to sit on their computer and book FP+ for as far out as they can, that means there COULD be 1,000 FP+ reservations taken every day. Magnify this to the actual number of APers. If APers are booking FP+ 100 days out, and I can only book mine 60 days out, they could be gone (or extremely limited) by the time I log on and try.
And of course it won't be that bad, but it COULD be. There are plenty of bad apples - which has been proven by the need to charge cancellation fees for ADRs and restrict overlapping ADR times. When given the opportunity, people will do bad things.
They're going to have to create yet another database where AP holders can create virtual trips in their MDE accounts, and then be held to them, with regard to FP+. Otherwise, there's just no way to determine when APers can book FP+.