That's some pretty optimistic thinking. Unfortunately, you just don't come back into a market after getting beaten badly and exiting with your tail between your legs. They have no developer support and UWP has, for the most part, been a failure if you judge its lack of adoption as a metric - where exactly are all of the UWP apps?

As for Microsoft "striking" when they get the software right - I couldn't tell if you were joking or not. There's nothing that Microsoft could ever announce that would ever make them relevant in mobile.