Android is already so open (both Android kernel and Dalvik VM), opennes is no criteria anymore. From the open source code, for example CyanogenMod has been created which is totally independent from Google. One can choose to use some other app store, web search engine, social media and have nothing to do with Google if one doesn't want to.

Only thing which still somewhat bugs me, is that Android is not following many Linux standards (but neither is Ubuntu btw) and is not very compatible with mainline Linux. But hopefully to this there will be improvement. Google also sees it would benefit it if improvements in the mainline Linux kernel would be easily usable to Android kernel. Google has provided many battery saving features to upstream Linux kernel already and the forks are getting more close to eachothers

Linus Torwalds said one year ago:
Some progress has been made already, so I am hopeful.
Android has so many things right, it may be easier to transfer it to fully Linux compliant mobile system, that build working mobile "ecosystems" from these other candidates (Tizen, Sailfish, ubuntu)