"While Google will never go the entire way and completely close Android, the company seems to be doing everything it can to give itself leverage over the existing open source project. And the company's main method here is to bring more and more apps under the closed source "Google" umbrella.
There have always been closed source Google apps. Originally, the group consisted mostly of clients for Google's online services, like Gmail, Maps, Talk, and YouTube. When Android had no market share, Google was comfortable keeping just these apps and building the rest of Android as an open source project. Since Android has become a mobile powerhouse though, Google has decided it needs more control over the public source code.
For some of these apps, there might still be an AOSP equivalent, but as soon as the proprietary version was launched, all work on the AOSP version was stopped. Less open source code means more work for Google's competitors. While you can't kill an open source app, you can turn it into abandonware by moving all continuing development to a closed source model. Just about any time Google rebrands an app or releases a new piece of Android onto the Play Store, it's a sign that the source has been closed and the AOSP version is dead."