If you want a Cambrian explosion of apps using Microsoft infrastructure and ad networks) if you're still in that business), just write QuickBASIC for mobile. That compiles to native code. Not a joke. Windows RT and all windows Mobile editions would have had an honest chance if Microsoft still remembered how to use its heritage instead of pushing for bleeding edge architecture astronaut frameworks every two years.

Compilers and interpreters are supposed to simplify development and automate as much as possible. don't make people learn new bibles of APIs every time an executive gets on stage to announce new products and software.

Give the simple, obvious stuff a try once in a while. Get back to BASICs.

Better support for Realm. All our apps (native apps both on iOS and Android) are build around Realm as the shared data model and while I prefer Windows as my dev platform the lack of support for Realm in Visual Studio and the fact that there is only a Mac version of the Realm data browser really keeps me from going back to VS. Also we might have considered experimenting with Xamarin, but the Realm support there is also pretty weak (same problems with lack of VS integration, sync feature not supported yet, no UWP version).