So you're taking it as assumed that there is one, singular interface that people will be using for the whole day. Even now, while designing and thinking things through I usually alternate between typing in a text editor, drawing on a whiteboard, taking notes on paper, discussing verbally with other people in the office, and just pacing up and down thinking to myself. The whiteboard for example is essentially a specimen of the much-maligned vertical touchscreen interface, and I don't see why it couldn't be made into a computationally-driven dynamic display.