Well, yes, currently the Windows UI isn't adapted for it. But that can be a job cut out for future versions of Windows.
We're also not just talking about single types of devices, but for instance, some people in the future might want to use, desktop computers with touch capacitive screens for certain purposes like illustration, in order to not have to buy a new device for it. A laptop with a touch capacitive screen will just be the counterpart to that.
Other people might want light weight iOS type tablet devices like the iPad.
Others might want something that can be suitable for both tasks, and adapt to both types of interfaces.