Re: no game need it
For some people, nothing's wrong with the scenario. But I think that's the problem-- it's only tenable for some.
I have a Surface Pro, and I find it useful only in specific scenarios. If I tried to do the majority of my typing (let alone all of it) on the Type Cover, I'd lose my mind. Depending on your use cases, convergence devices can be stellar, but they can also present compromises-- which is one reason (besides how Microsoft presented Windows 8 in the first place) that 2-in-1 devices are so divisive.
This limitation can be mitigated, of course. If you combine the Surface Pro with the Surface docking station, a USB mouse, a full-size keyboard, and a monitor, you'll have a very decent desktop replacement that also works as a (somewhat heavy) tablet and a (somewhat small) laptop. But collecting all that gear involves a fair amount of expense, which limits the market (especially the non-commercial market) to which the device appeals. I like the Surface line, as I've written a few times, but unless you fall into specific use cases, I still think they're too compromised to be used as primary devices and too expensive to recommend as companion devices.
I appreciate that you're defending touchscreen laptops, though. I don't think touchscreens add a ton to the experience (in fact, if I were going to buy a laptop tomorrow, I'd buy a MacBook Pro), but it's nice to have touch when you want it. After using the Suface Pro, I sometimes catch myself swiping at the screen when I switch back to a tradiitonal laptop. As I heard one of HP's PC guys argue recently-- even if you only use the touchscreen once per day, you'll be happy that it's there when you do. Some actions, such as swiping up or down a webpage, are much smoother with touch. That said, you can get a number of the same benefits on an Apple machine via their peerless trackpads.