Do you have statistics as to how the S7, or the Yoga are being used? No, but Microsoft does.
Just an anecdote of course, but my wife uses touch more than mouse on her S7. It's perfectly natural for her to lift her hand a couple inches from the keyboard to touch the screen to scroll web pages vs. indirectly scrolling with a mouse or the touchpad. A lot more comfortable than moving the same distance to the trackpad. Same thing with tapping links and such. But she loves that the trackpad is there when she's doing something that needs a bit more precision, like in Publisher or somesuch.
Most reviewers of touchscreen laptops seem to be surprised at how much they start using touch as an addition to mouse/trackpad and keyboard. It's obviously not a replacement, but a nice augment.
Also, this: http://www.theverge.com/2012/11/30/3710900/gorilla-arm-touchscreen-laptop-windows-8-apple (Bonus perk: that article references "toaster" and "refrigerator")