o_0, "FRB is already a fun park, and always has been.
...
To them, the entire bridge length is already a legitimate fun park. "
Couldn't have put it better myself. For every cyclist I can fault for wilfully being selfish on the Bridge, I see dozens of pedestrians being at least as bad. And some of the abuse I've received for politely pointing out their error... Some of the worst has come from the charity types who seem to think that allows them sole use of the entire carriageway. I'm prepared to guess that most of them do fewer active things for charity than I do (and I only do a few each year), but I never feels the need to ignore the rules (and risk injuring others) in doing so.
I think there's a good case to have pedestrians and cyclists use separate sides of the bridge (when one isn't closed for maintenance!). Yes, mixed groups (e.g. parents walking, children on bikes) would need to be an exception, but they'd cut down on areas of conflict if they were restricted to the pedestrian side.
Much as I'd like to see the main carriageway open for cyclists, I wouldn't really fancy it unless either a) a 20mph limit was imposed for the buses and taxis or, better, b) each side of the bridge was contra-flow, switching sides to even wear. Whether the necessary infrastructure would be feasible cost-wise is another story...