You're being optimistic. The realistic scenario is that stores could compete on price. (Even though they would still be required—per Apple's developer agreement

You're being optimistic. The realistic scenario is that stores could compete on price. (Even though they would still be required—per Apple's developer agreement and the recent court ruling—to withhold a percentage of each purchase/IAP as a license fee for use of Apple's intellectual property.) The only thing other than price is the opportunity to attract less scrupulous developers in a race to the bottom with respect to policy enforcement.