If you want the alternative app stores to become more popular like you say, there's no better place to actually name some of them than in the comment you just made.
Users expect to be able to do that, so it is a non-starter to run a commercial app store that Google's already turned into a second class citizen on Android.
Surely other app stores should be able to compete on an even playing field with Google, and be allowed to implement background installation, auto-upgrading and batch installation of apps.