Installing any app I want outside the Play Store was the primary reason I decided to go with Android, despite most of the people I know using iPhones. If I can't do this anymore, I may as well switch and be able to use iMessage and FaceTime with them.
You can still install apps outside the play store, but the developer does need to verify their signing information. Effectively this means that any app you install must have a paper trail to the originating developer, even if its not on the app store. On one hand, I can see the need for this to track down virus creators, but on the other, it provides Google transparency and control over side loaded app. It IS a concerning move, but currently this is far from 'killing' non-appstore apps for most of the market.
From a quick glance at /r/GooglePlayDeveloper/ it looks like Google is just as interested in killing playstore apps! It seems that they only want to support the existing larger apps now. I think they are giving a clear message to developers that its not really worth developing for that platform anymore. I think we will all agree that the playstore needed a purge but they seem to be making it impossible for any new solo devs at this point.
I have no idea what this means. How does this change "kill playstore apps"?