O-Line drought in NFL?

[Fastphilly]

Hello folks. I am a 49er fan and have been on this site for a while. I prefer this sight to many others due to the large amount of members and most here are very knowledgable football people.

My question is this, after watching tonights Rams / Cardinals game it's another story of a team with offensive line problems. I mean with the exception of a few teams, it's seems close to 90% of all teams are having glaring pass protection issues. In all my years of watching football I have never seen so many teams with O-Line issues. Is there a serious drought of O-linemen talent or is the NFL loaded with a bunch of incapable O-line coaches?

Your thoughts?