Just retire. A couple years ago I wanted him to stay around and get his 50th win well now he has 52 so good. The only divison he hasnt won a title in yet is Cruiserweight but please dont get any ideas Roy if you somehow read this. The mans 40 for christ sakes and his feet move like hes 50 he will get stopped by the heavy handed big guys there. 4th Tarver fight would make no sense,Johnson and Calzaghe rematches would almost be impossible to avenge,Hopkins made it clear he would not want to avenge a loss to this version of RJJ. He probablly could win a ABC belt at 168 or 175 but really whats the point ?
After seeing how he did against Calzaghe, he should fight a bum and then retire. Then he should come back to HBO and call fights again.
If he's gonna go out of boxing, then he should do it on a high. Train his arse off for a good 6 months, fight Hopkins and finish