WoD killed Glad Stance. It was the best Warrior spec early in the expansion, and then Blizzard murdered it so that it competed with Survival as the very worst.
Truth be told not too many people actually liked it that much, least as far as I remember. It was a very spammy spec, and the fantasy of being a damage-dealing warrior doesn't mesh with the 1h + shield combo. Plus I think Blizzard just didn't like the idea that tanks were a talent change away from being viable DPS, given that talent swapping was super easy in WoD. Cheapens the idea of a DPS spec or somesuch.
I don't mourn it that much to be honest, it always felt half baked to me.