This is why you NEVER NEVER NEVER give RBs a big 2nd contract. One way or another, the odds are never in your favor. Whether it is injuries, just the impact of being beaten up every game, or deciding you have enough money so you can be a jerk, it is only occasionally that this sort of thing ever works out.
Bell has become a loser. So, if he goes anywhere I'd suspect he'd go to loser type organizations. Perhaps Dallas. Maybe the Giants. Even Philly at this point (although not a loser organization, what do they have to lose by signing him?)
I'd be very surprised to see him go to any winning team.