They can't even make their own OS, they have to use Linux as a base. As that never took off this won't either.
Actually Linux is the base of Android OS as well. It's running my smartphone and lots of others. What Google does with Linux is change it a bit here and there, brand it with a name most people still seem to trust, and use its corporate muscle to get it onto devices (just as Microsoft has been doing with Windows and OEMs forever).
What's important for anything taking off is if you can bully, bribe or otherwise convince OEMs to use it. This was always a key element in Microsoft's success, and it seems as if Google is doing the same.