I agree with ummgood: There is some information which is important for the driver to be able to see quickly, and easily, without having to search for it. Eliminating the instrument cluster (or equivalent) directly in front of the driver would be a very big mistake. Having never seen an HUD I don't know how I'll feel about it, but considering the possibility of its being hard to see in some lighting conditions, and the possibility that it could obstruct the view of the road, I'd really like to have a conventional cluster in the normal place, and be able to turn the HUD on or off until I decide if I like it or not.
It cannot hurt to have information in more than one place. Eliminating the information from the usual place just to give the car a "futuristic" appearance would, in my opinion, compromise safety for no good reason.