I use the touchscreen on my pocket computer everyday. And on my laptop computer most days as well. And while you seem to be in denial that smartphones and tablets are computers, the people using then have no such misunderstanding.
The success of the iPhone, and the other smartphones, along with the iPad, show that there is clearly a market for touch screen computers. I'm a happy iPhone and iPad user. Just because you don't see the use cases, or because Microsoft did what they do when it comes to hardware, doesn't mean it can't be done.
I would be very surprised if Apple doesn't introduce touchscreen Macs by at least the third generation of ASi systems.