I think I was the only one who said I didn't play, lol. I've seen Vanilla raid videos and did that content at level 70, I remember that BC raiding was a lot more difficult and it wasn't just due to scaling. In the MC videos made during Vanilla there were DPS who would spam 1-2 abilities for most of the raid.
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I think there will be weekend raiding guilds. If people actually like Classic enough to get to level cap then I think raiding guilds will be fine.