That's not really true, not when you have eligibility left.
Also, I think people really overstate the risk injury poses to being drafted. Sure we've seen a few cases, but out of how many years of football? I can name a few people off the top of my head who had clear NFL careers either derailed or had their draft stock plummet due to injury.
The rest? I mean look at Tua, really the worst injury I can recall and Alabama quarterback having and he's drafted 5th. Look at Drake, a couple of major injuries, recovers, plays still gets drafted in the third round. This is a guy who never had 700 yards rushing in a season. Now he's 6th in the NFL in rushing and he's making 8 million a year.
I can really only name one skill player at Alabama off the top of my head whose career was ruined by injury and that's Prothro. In his case, it seems like it really wasn't handled as well as it could have and it was a total freak accident, not a normal football injury. Something freakish could happen anywhere though, one of the worst injuries this season was Trey getting hurt in a car crash. Alabama had a player shot once.
So... honestly this don't play because you might get hurt stuff, I don't think it's nearly the big deal some make it out to be.