Another interesting thing this could do is get some momentum behind alternative app stores on Android. They exist but they're not popular. But suppose some of the big names who are tired of Google's fees go together, choose one and put all their apps there instead. That could be enough to get people to start using it. At which point, if it was charging e.g. 5% instead of 30%, many other apps would move there too.
It could be the best thing to happen in this space for a while.