I don't understand why there's an expectation that this will be similar to the old AP program. They've only shown that they don't want the old system with tons of people with unlimited access to fill parks and not spend as much per guest per visitor compared to an out of town visitor. If they wanted old AP patterns they'd have kept the AP program like WDW. I think they're okay limiting AP revenue to capture more from other buckets with bigger spenders (relatively, because obviously any Disney trip is a big spend).
The entire point seems to be to decrease the number of AP holders attending each day. To do that either the price needs to hurts badly for unlimited visits ( top tier) or visits need to be limited for about the same price. Rephrased, it seems baked in that the new system will not be as nice as the old system, so they'll need to dangle a ton of carrots / "perceived benefits," probably ones that drive spend too (bump up merch discounts to 30%, etc.)
I think lower tiers should be more segmented than 12/24/36/48 etc. That seems both overly simplistic and also not segmented in a way to trick people into overbuying because that's a spot they're hoping to get people (unused visits). To that, if there are a number of visits I'd guess they'll allow rolling over to some degree, either requiring to maintain same plan or paying to roll some over.