QPR's management will do everything they can to avoid Barton appearing in hoops again. If they can't move him, he'll sit, as there's a long list of midfielders in front of him now. Only a string of injuries would necessitate his return. He'll go somewhere on loan, then, if he's been a good boy, somewhere permanent before the transfer deadline, or next Summer.
It's believed the club has added a clause that includes a Twitter ban, to his contract. He's certainly gone quiet lately. More pertinently, that further violent conduct will be cause for termination. No one's confirming this of course, but it makes sense for both parties. QPR could send him on (very expensive) gardening leave for the remaining three years of his contract which, effectively, would end his career. If true then a loan makes sense, if he screws up he could be returned to Loftus Road, then fired.
BTW: Where does the £70,000 per week figure come from? Not saying it's wrong but I've never seen his salary confirmed anywhere.
Also, Bothroyd and Helguson are both in the club's plans as of now, Heider very much so. Only injuries that would keep him out I think.