It seems like most teams lately have backed off aggressively going after punts as punters have become much better at getting run into and selling it. Teams just don't want to risk giving up a penalty for a first down for a low percentage chance at a block. Its probably better statistically to just set up your return.
I agree with the op about special teams becoming a increasing concern. Going back to the Clemson game with the killer muffed punt and then the st disaster on saturday it seems like we may be losing winnable games because of special teams play.