I agree, something crazy will need to happen, but maybe "crazy" doesn't mean unlikely--maybe it just means unforeseen.
I'm curious as to what evidence will be presented in this lawsuit. Is there stuff most of us don't even know about yet?
How's this for a black swan: What if in the course of the civil proceeding, there is irrefutable evidence Romney himself had a hand in directing illegal activities? Or evidence that he had direct knowledge of criminal behavior, and did not do anything to stop any of it?
If so, then this could impact Romney in several ways... He could try to make a deal and back out, i.e. concede the nomination at or before the convention in an attempt to wash his hands of it. (Remember, the lawsuit says a separate RICO criminal trial will be sought later against all involved in criminal activities during the Primary...)
Perhaps Romney could end up in handcuffs in a jail cell awaiting trial before the convention, similarly forced to concede the nomination. Perhaps this lawsuit will start to get the attention it deserves and he will simply be shamed into conceding the nomination, since someone with such dirty hands could not win against Obama presumably...
Maybe it's even possible the judge could issue an injunction disqualifying Romney from the nomination if there is sufficient irrefutable evidence he was involved in election fraud. (Even if not found criminally guilty, maybe the judge will say "You cannot run for President as I find that you personally are guilty of election fraud, and while this court does not have the authority to hold you criminally liable--that is for another court to decide--I do have the authority to bar you from the nomination as an additional remedy to plaintiffs in the case, because your actions have damaged them.")
I can envision black swans of many different sizes and shapes ever since this lawsuit was filed.
Even if Romney isn't proven to be directly connected with anything, if the suit is successful and all the delegates become officially unbound on the first ballot, we all just became a lot less crazy for thinking it is possible to win.