Karla and mrcharly-YHT: you can do better than that low form of wit.
Hubner: but disc brakes give a disadvantage, not an advantage, as Lennard Zinn describes
here (scroll down to “Rim brakes vs. disc brakes”).
Granted, the difference is negligible, so the best man wins anyway (unless he gets a puncture; see below). Marginal gains or marginal losses conferred by technology are less important than Trek and Specialized wish we believed.
The question remains how to change a disc-brake wheel quickly or service a mixed fleet in a race. There’s presently no satisfactory answer, but the pressure to get this technology on television is strong enough that it gets raced anyway.