No more healers needed in the future of WoW?

There are four talent trees out there that have been previewed by Blizzard. You can check them out here. 

So far, three healing classes, and the rogue. And all healing classes seem to be going in the same direction. Do damage so you can heal more.

LF8M VoA25, need dps, full on DKs

This sort of message I see all too often going around in trade chat. And every time I see it, I wonder what it means that you're full on DKs. If you need dps, a DK can dps, right?

But I guess they're going by their own greedy self. If I were a DK, I wouldn't want to share my loot with too many others....

Silly people.