It will NEVER EVER happen without US Lacrosse stepping in and becoming the governing body it is supposed to be. It will then pass down mandates to the Member Clubs. BTW - they should make it absolutely mandatory - that ALL CLUBS AND PLAYERS be registered. Get the insurance companies involved, and they can require registration with US Lacrosse to process any claims. US Lacrosse has to step up or the sport will be worse for it in the long run.
I suggest email them. I did last week. Its ridiculous that its gonna get to the point that more and more kids are going to get hurt. firstname.lastname@example.org - masses speak volumes.