I'm surprised that Goodell owned up and admitted he screwed up when he gave Rice only two games. But he should have left it at that. Misapplication of a rule/law doesn't necessarily call for a new, tougher rule/law that's even more rigid and more "one size fits all."
If he really wants to effect positive change in this area, he needs to reach out to others in the league office in determining punishments under the PCP going forward. This is a couple of years old, but underscores what's really needed.