how many people run them, I don't find the dungeons interesting enough myself to repeatedly run them on a timer.
currently my realm has only 3/9 dungeons done with a gold mode.
I have a feeling those challenge mode armor rewards for getting gold in every dungeon will basically either never be achieved by 99.99% of the wow population, if at all on some realms
if that's working as intended then that is fine, but I have a feeling they will be nerfed in the future possibly.