Touchscreen laptops are overrated.
Hype created by microsoft/manufacturers and not driven by demand.
I owned a cute little ASUS touch screen netbook which had win7 on it and touch was awesome. It was much more convenient to use the keys and touch than the keys and mouse for 80% of my use on it. After putting win8 (CP) on it I literally never used the mouse for anything and actually disabled the mouse so that I would not have to worry about rubbing my palm across it.
The issues were of course having finger prints on it which would have to be cleaned, and being an older resistive screen it added a lot of glare to an otherwise above-average quality netbook screen. But for anything in the 14" or smaller laptop realm touch is actually quite useful, and if they put a glass screen on it then it would be much easier to clean smudges.
Get much bigger than that, or in a desktop environment where you sit much further away from the screen, then I completely agree that touch is completely useless. However, I have high hopes for more gesture based motion control as found with leap motion or kinnect style technology to make touch-like controls more useful for those platforms.
Still not going to completely replace keys and mice though.