You know there's already a pretty big prize for descending in the Giro, is called Maglia Rosa and brings also quite a lot more money than the prize they cancelled. Just as an example, the queen stage will end with a difficult and long descent, presumably full of spectators from the previous climb. The winner will win a stage (again, much bigger incentive) and every second will count, going directly to the GC. There are plenty of riders in history who won or lost the overall of the Giro on descents. Furthermore, unlike the prize that got nuked, here every rider will need to participate, or at least every rider interested in the GC (which means money and WT points, don't forget), and also the terrible descenders will be forced to take significant risks if they want to compete.
So yeah, I didn't like the format of the competition so I don't mind that it got scrapped, but I find all this uproar quite hysterical, or at best, a very clear example of tunnel-vision.