Well, that's the thing, I'm a social member of Blue Garter and generally run with their alts or random runs. They only load up Vent for those if they are having problems with a PUG who doesn't seem to know what they're doing. We've had people figure out who is going in or out for spores during Festergut without any kind of communication, verbal or textual, and even if someone misses out, everyone has either the cooldown or the base health to survive with only two stacks of Innoculation (hence the hard mode).
Lich King is a completely different sort of fight and, like Anub'arak, it'll be months before everyone is comfortable and experienced enough with the fight that coordination won't strictly be required. Text works just fine when you're playing with competent people, though. That's sort of my prejudice, too: I've seen it work time and time again over the years in FFXI and WoW that people coordinate as well or better if they're not able to talk freely. I don't mind people socializing, but time and place. Trash packs are ok, but except for the initial stuff in ICC, you shouldn't be taking more than ~10 minutes to get through any trash in the place and instead should be focusing for bosses because heaven knows the place takes long enough without adding additional delay into it.
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