Is Laurence Summers's announcement that he will resign a signal that the economy is headed for catastrophe?

Here's a fun one: Georgetown law prof Adam Levitin says at Credit Slips that there may be a "plausible personal reason" for Summers' decision to leave as head of the President's National Economic Council. But Levitin is worried that the real reason is that Summers thinks that the economic "shit is really going to hit the fan" and that Summers doesn't want to be at the White House when it happens. I guess that also means that Levitin thinks that Summers may knows something that we don't.