Well, it seems that most everything to be said about this has been said (multiple times), so I'll just give my experience with owning a touchscreen laptop.
An article I came across regarding laptops, but most of the points they make apply still to a desktop monitor. laptopmag: don't buy a touchscreen laptop<br>
I spent well over a thousand to buy a a top of the line 15.6" thinkpad yoga laptop with a touchscreen. And I've regretted it ever since. I've hardly used the touchscreen, because when it comes down to it, it's just -soooo- inefficient to try to use our fingers, compared to even touch pads, which are known for being finicky. Even the fact that I can fold my laptop in half and use it as a tablet is a useless feature, since this laptop weighs 5.5+ lbs, and ends up being WAY to heavy to even think about carrying one-handed.
All in all, touchscreens have their place, and that place is on the front of small, light tablets and phones, devices that cannot be used with mice, since we carry them all around with us and usually use them in locations without a stable, solid surface.