The goal of the R-PI is not (necessarily) to be as small as possible, but to be as low cost a cost as possible. I am planning to buy one to see how low cost I can go. I am not trying to be stingy for its own sake, but to see how low cost a computer really can be.
This has already meant forking out £79 for a Samsung monitor in the sale at Currys (21.5" screen HDMI/DVI/VGA). Like most monitors modern enough to have HDMI inputs it has VESA mount points, and I guess that most R-Pi users will be using a freestanding monitor on a desk not fixed to a wall (because they will have a keyboard and mouse).
To really keep the total cost of ownership of the R-PI to a minimum, it would help if instead of the current board size (85.60mm x 53.98mm x 17mm), some production boards were made with the same width as the length (85.60mm) with M4 compatible holes drilled at the corners of a 75mm square, so the cost of mounting the board on the back of the monitor comes down to a few pennies for some M4 screws and washers.
If it helps, just mark the holes and I'll drill my own.
OK, if it saves money, don't bother with the markings, just leave space on the board