i would not say it is not working, it is just not working good enough :D
i am also not smart enough to see how would big stakeholders benefit directly from the actions. (i see how would they benefit from hive price going up) and i never checked but most probably have a decent amount of HBD so in the short run they would probably benefit more from just letting the price pump and selling it. I know blocktrades mentioned on the clowns post that if this does not work in few weeks he is considering the option of leasing the HBD he owns and dropping the exes proposals for stabilizing. So i think he has some amount of hbd