Re: "looks for ways of getting people to write Universal apps"
Is that 30% really stopping anyone more writing them? No, it is the fact that there is no one is buying Windows Phones, meaning you will make a pittance whether you collect 70% or 100% of the top line revenue.
They don't need universal apps for their tablet, because people don't use Surface as a tablet. They use it as a laptop, and run laptop apps on it. Even Google can't get people interested in writing tablet apps for Android, or even making the UI anything more than "same as on the phone, only bigger".