We can do more in terms of treating the effects of head knocks, but realistically can only marginally reduce them by using rules which may damage the product on the field. The real question is, can we have sports which result in potential long-term issues? If players are fully informed as to risks and continue to play, will that legally protect the sport? Because ultimately that's all there is.
One thing's for sure though, any ex-players hoping for a lot of money out of the game through the class action are going to be sadly disappointed. We might all wish they could get proper payouts, but RL in England is a financial minnow, not the NFL - most clubs operate at a loss and own no assets worth squat. Good luck getting money out of any insurance the sport may have as well.