Black yellow boy, stop being nasty.
I can't really see them knocking much more than a pound off the limit, tbh. The rule is as much about reigning in development costs as it is about weight. As you say, the safety thing doesn't really apply any more..
From what I understand is the review is more considering the weight of bike with rider, which I think would be interesting. I would be interested to see if rider shape/size changed drastically.
You would have the same situation that jockeys and boxers have to deal with - having to make a target weight.