I was speaking more on the player side of things rather than development. For every 10 players now progressing themselves via whatever solo progression system Blizzard adds that's 10 fewer players available to interact with group content.
I've noticed a lot fewer angry whispers post player contract but that's obviously anecdotal. I've seen a few people post about getting their accounts banned then having their appeals denied because of the social contract, too. It'll take awhile before we see any major shifts in general behavior but it does seem like they're at least trying to combat the worst offenders.