The increased safety rules actually put mobile QBs in worse jeopardy. Now, every ballcarrier is getting spiked in the knees by defenders trying to avoid helmet-to-helmet. The rules are made to benefit the pocket passer--you can't lay a finger on their helmet and you can't hit them below the thigh pad without drawing a roughing penalty. Outside of the pocket, all that goes away. Ask RGIII about poor tackling.
That's not entirely true, what about the slide rule. And, I bet we will soon see a "defenseless" quarterback rule for the case I which they have pitched the ball to the runner instead of keeping it. Whoa, can't hit that dude, he's just standing there and not trying to block.
Also - ACL injuries are one of happenstance, of turning or twisting the knee at the wrong time.
The running injuries that you are thinking about are the ones most likely to affect a Tebow style runner or a pocket passer that get a bug up his arse to run. Not only did Tebo have back to back years of bruised ribs, he also got worn down on some games. I did not see that a R Wilson. I saw a little of that with RGIII but mainly because he really puts himself in some dangerous spots. And let's not forget that A Luck has some legs on him. He gets out and runs too. Wanna know what I'm sick of, I'm tired of the elitist attitudes that look down on run in QBs. Hell man, none of them are growing up to be brain surgeons.
Cheers. Go Seahawks. Go Pack.