It is a bit futuristic. But I’ve seen travel agent using two LCDs back to back for each of its agent service desks. Quite good an idea but redundant and bulky with two sets of display hardware and cables! So major LCD manufacturers should look to this market niche while a dual-face LCD is also applicable for notebooks for easier presentation/demonstration/interaction purposes. Imagine, if touch screen manipulated on LCD of one side and keyboard/pad on the opposite, two persons can interact on the same computer simultaneously when sitting face to face. And this makes flip-over mechanism of a convertible notebook (notebook+tablet in one) unnecessary too.
Alternatively we may develop apps to wirelessly sync two or more computer screens and controls to achieve the same purpose.