There is a negative network effect: The opt-out is so complex and time-consuming that it will deter almost all users (even if some on HN say they will do it).

With so few users, many fewer developers will release apps that don't comply with Google's requirements. Then the value of opting out will decline significantly, which will reduce the number of people doing it, which will reduce the number of apps released ...

How do corporate users distribute custom apps on iPhones? Must they distribute them via Apple's store or is there some corporate mode, maybe involving X.509 certs and device management, that enables large-scale professional users to sideload?