Jnor
Peter Fenwicke (45)
Another option is also to speed up the game, meaning the players have to be fitter, and the smaller guys will start to be picked over the bigger guys. Crude logic being smaller guys dont hit as hard. I think this could also have merit.
I actually think the reverse might work. A lot of the realy bad injuries seem to happpen when players hit at v high speed. If everyone was a 130kg prop playing on a 40m by 30m field I think we would see much fewer concussions and head injuries