It's bizarre thinking to be honest.

iOS is never getting rid of the App Store and given that it is the lead development platform for most apps it still sets the direction for the industry. Which is perfect for Google because it cements their control over the Android ecosystem as well.

If Amazon was smart they would go after Microsoft instead and try to build some smart, next-gen cross platform productivity and consumer apps backed by intelligent backend services. Control over user data is where the real money is.