This definitely sucks. He really made great strides this year. I hope it doesn't affect his draft status. If there's a silver lining in this though, we'll get a jennings preview.
If Willi McGehee could get the bottom of hs leg ripped off and be a first round draft pick, I don't see this hurting Zach all too much.
SI thinks that the injury might drop Mettenberger from as high as pick #7 to the second round because he won't be able to make the pre-draft workouts. That means millions less money for him. http://nfl.si.com/2013/12/03/2014-nfl-mock-draft-marcus-mariota/
I agree to the extent that I wouldn't see Mett starting his first year anyway. And if he is going late in the first round, that team probably already has their starter or at the very least someone Mett can learn under.