The end of the NFL concussion crisis, what happened?

Fair point in the sense that most professions involve some level of trading your well being for labor, as anyone who works in a job that even remotely involves manual labor can tell you. The difference here, for me at least, is that my attention would directly subsidize a system that clearly costs young, often under-resourced minorities decades of their lives. That really should be tough for people to sit with.

I'm sure people made the same argument when gladiator sports (that were played to the death) were a thing.

Should a sport that demonstrably and predictably leaves so many of its players permanently handicapped so early into their lives solely for our entertainment continue to exist?

I don't think so, but I'm biased, as I strongly dislike American football and the culture it espouses.