This is why I've been very hesitant to try and speculate tiered pricing at WDW.
Everywhere else it is done, there is a single park or a park that typically sees a lot of day travel guests. I'm not saying it won't happen or Disney can't make it happen, but there are many variables at a place like WDW that it makes it very hard to speculate how they would structure it. Back when Disney did tiered pricing survey, TP wrote up
a blog which has a lot of good points (for/against).
The big stickler to me was regarding how complicated it makes the ticketing structure. You look at that gold/silver/bronze calendar and you immediately have a ton of questions about how you're supposed to buy tickets for a trip that spans all the various levels.