Have to disagree here since there are now more mobile devices than desktops and that will never change back.

Desktop is an old way of thinking. Microsoft has been losing that battle for quite a while. Distributed computing, or the term "cloud", is where folks are truly going and it's been successful for iTunes - you don't need a Mac to update, purchase or have access to their media offerings - and also Amazon with their App, Music and Video Store.

Desktops are not necessary because people are migrating away from them. Most people are using smartphones. Ecosystems need to be dependent of desktops.

That's where Microsoft is going way wrong. Apple even has embraced that.

Anyway, I think you're missing the point and that's why WP isn't taking off either.