The people who are here now, who weren't here a couple of weeks ago, are going through the process of either [this is different] -> [I don't like it] -> [leave], OR [this is different] -> [maybe I do like it] -> [stay]. Only a very few are going [this is different] -> [I don't like it] -> [stay]. If twitter suddenly goes down and doesn't come back up, *thousands* of folk who should be in the first group will find themselves in the third group, and the third group destroys communities.