Iowa generally recruits by region, so I don't think the coaching changes have adversely affected the OL recruiting, but, there's no doubt that development of the line took a hit when Morgan was moved.
I've posted previously that I haven't seen any evidence whatsoever that Polasek is a good coach. He has had some recruiting success, but, as a coach he seems to be all fire and brimstone in practice with marginal results on game day. I'm willing to give him a pass with all the issues last season, but if we don't see a significant uptick in play by the OL this season, my guess is that the majority of fans will start to give up on him.