> [...] copy all the APIs and create an independent alternative that lets you build apps that use features from Play Services, without tying your app to Google.

From http://en.wikipedia.org/wiki/Replicant_(operating_system) :

> Replicant is a free and open source operating system based on the Android mobile platform, which aims to replace all proprietary Android components with their free software counterparts.

So I think that at some point maybe the Replicant guys might get to a point where they do what you are looking for, if they haven't already.