As all the steem from steeminc are now obviously powered up I do not understand your action... I mean as long as he does not start a powerdown there is no risk of him dumping his steem on blocktrades...
IMHO by shutting down blocktrades you are actually helping him because people can not buy more steem to power up and support the old witnesses or you are forcing them to use those very exchanges that betrayed us and their customers!