I read a story in Quartz today that shared that Nest will be bigger than Android.
Image Source: Google
I agree with the author that Nest will be huge for Google but I don’t think this is about Android v/s Nest. The recent announcements around Android powering cars are a strong indicator of where Android is going. It already powers Chromecast and Google Glass.
I believe we are more likely to see Android power the next generation of connected devices including the ones Nest has already built. Android will power Nest, not compete with it within the Google ecosystem.
The real question is whether you will need a Google+ account?