They actually will come out and condemn wearing a mask, have seen and heard of instances of this in the past. The standards everyone is looking for are a national standards ratings of required yield stresses on the mask material and type of construction. Welds have to stand up to a minimum stress, steel cage has to also, and on ad nauseum. NO STANDARD EXISTS AT ANY LEVEL FOR A FACEMASK! The national underwriter for football helmets, baseball helmets etc. ( can't remember the letters) does not have a standard testing criteria for facemasks. It is an expensive (VERY) procedure to acquire, but it cannot be acquired if it does not exist. With no national level of standardization in existence no governing body is going to take on the liability of requiring a mask be worn. If something happens to the mask and the girls l is injured because of it, that organization ceases to exist. They would assume the liability of having forced a girl to wear a mask that failed and contributed to serious injury. Do you think a governing body is willing to take this on when they don't have to??
And oddly according to the research I have seen and spoken to the researchers about, the most injuries are not from batted, but from thrown balls.
Sadly nothing will happen until this first issue of manufacturing standardization is addressed and fixed. And this is not a manufacturer's problem, they make a good safety product, it's a national certification problem, what it has to withstand, etc. it is a very costly procedure, paid by all manufactures, but it DOES NOT EXIST, therefore it cannot be enforced by anyone.
All that being said, it is a smart Item to use I feel. My DD uses hers, but if a parent isn't on board with this piece of equipment, there is no way (and I waffle on whether there should be a way) to make them use it.
So if you want your child to wear it,'make them do so. Once they get used to wearing it, if they keep on wearing it for their entire career, all the better. Be you will never be able to force another person's child to do so over their and their parents objection.