I don't think you should blame Google for putting resources into a platform of less than 1% of the market-share that's not built by Google itself.

Google has actually been pretty eager in developing iOS apps AFAIK, sometimes releasing it even sooner than Android platform. If Windows Phone really gained traction, maybe Google will develop apps for it too. Remember it's more of a service company than a hardware company.

But MS never got out of that vicious cycle. Can't shift blame to its competitors.