One thing that is related to this, but doesn't seem to have been talked about....
We keep saying DPS need to start to think... Well so do the Paly Tanks. I was in H.HoS last night as a Disc. Priest healer. We cleared everything just fine up to the room where you meet Brann (Just prior to the 3rd boss 'event')
So the Paly tank runs into the room of (what?) 4-6 giant/golem things. He attempts to pull all at once. I waited as long as I could, but he started to go <50% and I'm a relatively weak healer ~ So I didn't want to risk it. I shielded, HoT'd, and dropped a PoM on him in slightly longer than 3 Global CD. The tank lost agro and I got 2-shot.
Tanks need to also adjust to the new agro situation and start to manage pulls accordingly. Yes - DPS probably needs to adjust more. But the days of arrogantly strutting into a room and pulling everyone while you ALT+TAB to browse the internet are over....