I think Ubuntu Touch is an interesting alternative. Asl an Ubuntu user I am somewhat compelled to consider it. However We haven't seen Android push the other areas very hard yet.
I believe that it still has space in the media center range as well as the desktop/laptop computer area... I'm disappointed that #Google
hasn't quite seen this or gotten it down yet. The Nexus Q was an almost there idea. The Transformer line has shown some, me included, that Android is very viable as a Computer OS.
Something a lot of people miss too, is that Android has Chrome Browser in it, hence Andorid should do just about anything ChromeOS can too.