You could imagine giving each Deluxe guest one more FP+ per day---under
the best guess at park capacity, a 3FP+/person limit leaves enough spare capacity to play with. You could even remove some of the grouping restrictions---so all three FP+ reservations on headliners rather than only one or two. But, you probably could not give them carte blanche access to all attractions, true.
Don't kid yourself. Any credible biography of Walt makes it clear that he was after a profit, and that he wasn't worried about universal access so much as synergy across the park, the movie studio, and the merchandise. The guy practically invented it. Start with Neal Gabler's book for an even-handed take. The parks were never cheap (in a relative sense), and in the very beginning there absolutely *was* differential access, because Walt was the guy who invented the A-E ticket system, and those willing to spend more could buy more E tickets. Walt didn't want you and I to be happy, necessarily. He wanted to sell happiness at a profit.
No, this is all pure speculation. In fact, Nick Franklin, the VP of NextGen, has stated in an interview that access will not depend on the resort category in which you stay.
Here's the thing: all of the other US amusement park operators---
all of them---do this already. They charge everyone the same price for tickets, but they also sell expedited access to attractions in some form or other. They've been doing it for years, and it works for them. Yes, some guests do grumble, and maybe a few even decide they won't come back. But, the loss of revenue from those people has been more than made up by the extra revenue from guests willing to pay more for shorter waits. It's a settled issue.
I suppose you could argue that every single one of these operators has rocks for brains and is actually losing money overall by selling such access, but it doesn't seem very likely, does it?