There is a large group of scientists and researchers as well as engineers and physicists that are moving towards a capacitive touch-based device for future manipulation. What you currently see as the HP Touchsmart PC might one day be available for any and all to purchase in the form of hardware (either in the monitor or perhaps as a sophisticated sensor system).
A touch screen poses a unique problem for manufacturers though - who wants to be touching a screen that has traditionally been kept in odd positions on desks (at an angle, etc)? Furthermore, what about people who are not willing to spend the several hundred dollars that large-scale touch screens would cost? How do you fold those people into the market?
Today’s consumer sees a touch screen as a cool innovation, but at the same time, as a sort of gimmick. Only on devices such as the iPhone has a touch screen proven to be efficient enough to work as a dedicated system for controlling a device. That being said, the iPhone and other touch smart phones are all portable devices that are easy to grasp and touch without the discomfort of having to touch a computer monitor all day long. Ideally, future PC monitors would then work as tablets that can be carried around, but that too would cost a fortune.
So then, what is the solution to the problem that is manipulating the screens of the future?