Bzt. The real reason is that the promise of "open source" in Android has always been wildly overstated. Over time, the OEMs have come to realize that Android

Bzt. The real reason is that the promise of "open source" in Android has always been wildly overstated. Over time, the OEMs have come to realize that Android is prone to vulnerabilities, they don't get the support for updated code that they do fully purchased OS's, and google is rapidly eliminating any opportunity for differentiation of experience. Google wants the OEMs to only focus on the plastic covers of the phones, which does not make a sustainable business model. That forceful negotiation over time has resulted in Samsung's investment in Taizen and a legitimate opportunity for FirefoxOS & Ubuntu for Phones. All it's going to take is for someone to create a VM on windows phone and the other OS's for executing android sdks- google is going to be in real trouble with their OEMs. The OEMs won't drown without lashing out for survival.