Your point is well taken, and I have read all the posts in this thread. Perhaps one more obvious sign for descending hikers would help, but that is not a guarantee. Exhaustion and/or excessive speed during any descent of a peak can cause confusion and mistakes regardless of the experience level and fitness of the individual.
Mt. Whitney will continue to be a magnet for novice and expert hikers, but how far ought the Park and Forest Services be expected to go in order to ensure the safety of every hiker?