I saw an article today on Ars Technica that has a really good write up on how Google is controlling open source Android. In a world where Android has 80% of the market, I can certainly see why Google is itching for more control. I can't fault them.
In a Headless Android world, many of the points in the article don't hold much sway. It's mostly about apps and Google Play services. However, some of the APIs that have been tied in to some of Google apps, like location services, could be very relevant to Headless Android.
Here is the link. It's worth the time to read.
Google's iron grip on Android: Controlling open source by any means necessary