While making Windows RT into little more than an Android skin may sound nice on paper, I don't really think it makes any sense for Microsoft to do that. Windows is more than a UI, it is a platform for pushing Microsoft's services. Getting you using Office, SkyDrive, Bing, Xbox, etc. is key for Microsoft and there is no place where they can be integrated more seamlessly than in Windows. Now of course this could also be accomplished in Android, but it probably wouldn't perform as well as something developed from the ground up by Microsoft for the specific hardware it is installed o as is the case with Windows RT. It also would create a weird divide between x86 Windows and Win RT as they would essntially be entirely different OSs at that point.
In addition to that, using the Google Play store means a couple of things. Firstly, Microsoft can't profit off of it in the same way that they can from their own store. Secondly, it means that they have no quality control and malware is a possibility. And thirdly, it would mean that Metro would effectively serve no purpose as the vast majority of apps would never bother conforming to it's design language or use it's APIs. In effect, Surface would just become another Android tablet.
Now of course Microsoft could have it's own app Store like Amazon does, but then that puts us back in the same boat and they'd be better off going they same route they are going now at that point.
Besides, x86 Windows is not dead- not on desktops and not on tablets. We've got several Bay Trail tablets coming this year that will perfeorm fairly well, have great battery life and still run all your old apps. So if Windows RT has no future then it is not the end of the world.
But I think over time the situation is going to improve considerably. It may never outpace Android, but it doesn't need to to be successful.