LOL.
There's a bunch of problems with what everyone's proposing, but none really are the real issue.
1. you cannot use college athletes and pay them; that is a violation of NCAA eligibility rules.
2. guys at the senior bowl, especially guys who might make the top 3 rounds, do NOT want to take part in something that might get them critically injured before their NFL career even begins. How would that look if Tim Tebow went in for mocap and tore his ACL right before the draft? You think he would've gone to the Broncos in the first round?
3. The EA mocap studio is in Vancouver. You have to fly football players into Vancouver because, well, football just ain't that big up there. The same complaint was made about Live (Elite); there's just no good basketball talent up in Vancouver, so the mocap never looked all that great because they got guys at the local Y or whatever who just weren't that good.
The biggest problem, though, is that the animation group ends up skewering and butchering the animation. You could put Chris Johnson in the suit and get a beautiful run cycle out of him, with "perfect" mocap data. The data then goes to the animation group that chops it up into tiny pieces to fit their new ice-skating locomotion system. Everybody moves like they're skating, and it has nothing to do with how the data was captured! It has everything to do with what happens POST capture. And until that gets fixed, you will continue to see choppy animations, skating football players, and robots who could ... go ... all ... the ... WAY.