From his perspective his funds will be frozen again the moment he lets go of his sock puppets. So the only thing he can do is to keep voting, otherwise he's going to be locked up and unable to make any moves.

I don't like the way he's reacted to this whole mess any more than you do, but you have to signal a way out for him to break the stalemate. If he continues to vote in his witnesses, then tough luck, evidently we can fight him enough to veto his proposed changes.

The other possibility is he cashes out, which would decentralize the chain further and that's a good thing in my eyes.

The last option would be for him to build something with the community and get some ROI.

But all of these possibilities won't become a reality unless you guys signal him that it's okay to get rid of the witnesses.