They were kind of a pain in the butt, and I think Blizzard realized that. How many people really liked being dead-ended in a zone because you needed to find more people for a group quest? Heck, when you picked up a group quest, how often did you try to solo it anyway? I know I did that with all of my group quests. They're just not all that fun for most people, and littering the countryside with them for no good reason doesn't do much to make your zone more interesting. The few that exist should be meaningful.
Phasing adds another layer of complexity to group quests, also. With most group quests, you probably didn't join a pickup group in zone to do the quest. You probably asked friends or guildmates to help you. With phasing, they can't necessarily just pop over to where you are and kill whatever big bad you're fighting. Which is the better option: using phasing to provide the player with a better narrative, or not using phasing so you can make your guildmates come beat things up for you? Group quests have their place, and I hope they don't ever go away entirely, but there isn't much gain in having many of them. The few that exist should be meaningful and have a damn good reason for being group quests -- rewards, instance training, whatever.
What will happen when my authenticator battery dies?
You will have to contact Blizzard, get it removed from your account (after verifying that it is, indeed, your account), and have it replaced with a new one.
I saw a blue Bloodfang hat stop in Black Morass. Is there a complete set like that?
Indeed there is! Most tier 2 sets were reskinned for Burning Crusade dungeon drops. The full Bloodfang set consists of:
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