Devil’s advocate pov, CTE isn’t likely to be anywhere near as high in skateboarding as it is hockey, football, and boxing/mma. There’s also low risk of repeated concussions in close proximity to each other bc head injuries are usually infrequent. And helmets are only of limited benefit as has been mentioned.
1. The most obvious thing that should be phased out is downhill skating especially in urban areas. It’s dumb as hell and skaters have died and will die from it.
2. No alcohol and skateboarding, ever.
3. Skateboarders who aren’t broke in the US should get high deductible or catastrophic health insurance with an HSA plan, and the broke ones should be signed up for Medicaid. Head injuries are largely untreatable though assuming no blood clots, comas, etc.