I would agree that the horrible OL line play is the biggest issue with this offense. You cannot do anything consistently well with a horrible OL. Can't run the ball consistently. Can't get enough time for your $20MM QB to make better decisions. Will eventually get your QB killed. I know the Hawks had to pay the key guys and I am glad that they did but it is nearly incomprehensible that they went into this season with this motley crew of linemen. Absurd.
So, yes, if a significant upgrade can be made at this position - we need to do it. It should benefit future years as well. That being said, I cannot see giving up a first round pick for some 30 year old guy.