In many ways, the most difficult decision would be how to merge the two different app development environments. Andriod is getting traction (in part) due to some excellent apps. These apps are developed in java that compiles to Android specific bytecode. So, from that, any merged OS would need to maintain the Android VM layer, otherwise backward compatibility would be hard.

On the other hand, chrome could be ported to Android quite easily.

So I see a Android like OS where Android Apps and Chrome web apps exist side by side (on the same desktop).