In a way, the Crossing actually did retcon the Pym slap. It revealled that his break downs were due to Kang messing with his mind, and in comics mind control effectively is a free pass. Jan and Hank were pretty much getting back together again and he seemed to be moving past it.
I think the problem is Busieks Avengers Forever retconned the Crossing and took away Hanks free pass. And that basically opened up the flood gates for anyone to revisit the issue, which Chuck Austen did. There was no putting the genie back in the bottle after that.