Perhaps I should explain further - while, yes, you can literally sue anyone for anything these days, my point was that I think the schools are pretty well-protected as of right now based on their own policies.
I did a quick Google search (literally 30 seconds) and found only one case of a former football player suing a school, and that is Bernard Hicks suing Cal in Aug. of 2015. Hicks claims the university didn't provide him accurate information regarding the long-term (and short-term) impacts of concussions. The following quote comes from The Daily Cal.
http://www.dailycal.org/2015/08/12/former-uc-berkeley-football-player-sues-university-for-alleged-concussion-related-medical-malpractice/
Cal Sports Medicine’s current concussion management plan specifies protocol for coaches and health-care providers in the event of a concussion. According to the concussion management plan, all student-athletes are provided with written education material on concussions annually and must provide a signed acknowledgment of understanding its content.[/size]
So, this is kind of why I said my assumption is 'no.' I don't think the litigation would go very far in today's current climate surrounding concussions, at least at the division one level. Unless people can unequivocally prove they never once received concussion related information then the university will be protected - the burden is on the proof, of course.