I always feel like information helps people make the best decision for their circumstance. I did a quick Lexis search on copyright suits filed by Higbee since April of last year. Keep in mind, Lexis doesn't have everything so it's probable that the results I saw were incomplete. He has filed for a lot of different clients, but the top five seemed to be Michael Grecco Productions, Inc., Christopher Sadowski, Alexander Wild, William Farrington, and Adlife Marketing Communications Inc. Also, most of the filings seem to be where you would expect, California, New York, Texas etc., but Higbee also seems to have a lot of one-offs in other states like Oregon, Michigan, Pennsylvania, Utah, etc.
The point is, depending on who the photographer is and where you are located can help you decide your odds of being sued and if it's worth trying to ride it out, or just to negotiate a settlement and avoid a lawsuit. Only you can make that decision.
As far as the lawsuit with errors in it, from what I have seen, the draft lawsuits they send out tend to be different than the ones they actually file. At least that appears to be the case with the recent RM Media lawsuit that someone else posted about last week. My best guess is that if they decide to sue, they have someone review the case more in depth and redraft the complaint to fix any errors before filing it, so I wouldn't bank to much on that.