So this team tuned out Joe, tuned out Ime for half a season and tuned out Brad. I don't think there is anything that can be done except for an attitude adjustment. If these guys are capable of such an adjustment, why not have Brad come back down from the front office and coach this team the right way? Brad is a great coach and was a selling point for free agents.
Additionally, I don't think Brad failed as a GM. He was/is rather good, with the exception of not filling Joe's spot this year. The personnel decisions have been great. He had some bad luck with the Gallinari injury, but Brogdon was a very good find and getting Horford for Kemba was fantastic too.
This team is completely underperforming in the ECF, but they are still in the ECF. I think with Brad instead of Joe coaching, we are either in the finals or at least faring better than we are now. Let Brad coach the team he assembled.