The athlete can take out the policy, and the NCAA has ruled that schools can help with payment through the NCAA Student Assistance Fund. Also, the athlete can take out loans against future earnings. With current draft projections, Epenesa would definitely be a good candidate for such a Loss-of-Value policy:
http://www.ncaa.org/about/resources/insurance/loss-value-insurance-faqs
Of course, if something truly devastating happened, this policy would probably come up well short of covering his NFL contract guaranteed money. But then again, he could quit his collegiate playing career right now, train solely for the NFL draft, and he could still end up getting hurt:
https://thespun.com/nfl/nfl-draft-1st-round-prospect-tears-acl-during-training
There is always risk, and there is always reward. You balance them with your own priority-system, and you make your best decision.