consider sideloading is already a thing on android, and no one is really complaining. i doubt this catastrophic event you anticipate will happen.Easy to say right now, but that falls down when most major apps decide to leave the app store to avoid the fee to Apple. Then you'll only be able to get small-time games and utilities from the app store, and if you want any real functionality you'll have to sideload because all the major publishers only put their apps out that way.