I'd cut him. I don't see what he brings anymore. He can't run, his confidence is shot, he can't read a defense, he can't feel the pass rush AT ALL, he even sets himself up in a position where even if the line block for him he still gets sacked because he's 9 feet deep - beyond the pocket they're trying to build, he can't command an offense, he can't address protections properly - to the point where his running back is tapping him on the butt trying to get his attention to tell him the weak side backer doesn't have a back assigned to block him, he's got a terrible ego and a sense of entitlement that suggests that he is the greatest QB in history, his teammates apparently hate him, and Kirk Cousins is a safer bet.
He's not their best QB - and he never will be; and that says something because Cousin's isn't a world beater either. So you've got to sit him and pay him or watch him get hurt and pay him $16m!
For the Redskins he's worse than nothing - he is a drain on the team and their resources. As long as he remains there will be controversy because of people looking at his 2012 season - he can't do that again. It is not going to happen. So recognize you've got a junk investment here and cut your losses as soon as you are able. After all, you should never reinforce failure.