We were chatting for just a moment about this at the barn a few days ago.
We already require helmets for jumping. Me and some of the other ladies I ride with also use the protective vests. We were talking about how we could further mitigate risk, and want to propose a rule to the BO that you can't jump alone, you need to have someone on the ground with you in the event of a serious incident like this. We have our group of jump people, but there's a few strays at our barn, who were either trained in jumping and do it solo, or some people who just think it's fun to randomly try it.
We are also looking into rebuilding a cross country course at our place. My big thing, it has to be safe! I know they have more recently started making those fences safer. Risk mitigation is so important!