Not to mention: Why would you want your hands and arms blocking your view of the stuff you're trying to manipulate on-screen?
Entire companies have already come and gone because the "Minority Report" UI has no legitimate use case.
I already use touch on my XPS 13 and it's just another nice accessory, which I often prefer over a mouse (especially for mobile use). If I move from keyboard to mouse to click a button, I can also just touch it. Or lazily scroll a page. But it's a mistake to assume it should replace all other input methods instead of augmenting them; forcing that on a user sucks, yes.
Edit: Oh, and I just played "Root" on a 43" touch screen sitting on a table. Works well, except that I need to integrate it into the table.
Guess you’re talking about Leap Motion? I reckon they might have been 7 years too early to market. I could see this kind of thing picking up traction when AR/VR really becomes mainstream, maybe not as the main input source but I could see it for less commonly used actions.