Now obviously, every guild is in a different place raiding-wise (and most guilds are way ahead of ours, I know), and TLaG is dealing with a different dilemma: whether to take down Yogg-Saron before moving on to ToC or not. And in her case, she's got the added "gotta catch 'em all" thinking. But it's a tough thing as a raid leader -- you don't want to move on past content you know you can do eventually, and progression always beckons. In the end, you've got to figure out what's best for the guild. And of course, the content's not going anywhere -- if you can't drop a certain boss this week, there's always the next raid reset.