No, more often than not they'll grow up writing Linux, iOS, Mac, and Android tablet apps. I've never actually even seen a WP7 device or a Metro app. Even shrinkwrapped apps coded entirely in dotnet are relatively rare. Even once Windows 8 starts shipping it will many years before Windows developers can ignore the billion-or-so computers still running Windows 7, Server 2k8, and below.

Compatibility with the native Win32 app ecosystem is the primary source of Windows' monopoly on desktop computing. Microsoft products rarely succeed outside of that (like any other company). For them to actively try to kill that off is truly insane IMHO.