They haven't had to adapt at this rapid of pace. And this is also a human story. Yes the crabs may pull through but not in the abundance to provide us a food source.
“When I was in Hong Kong, I spoke to my partner in Rio via Skype and told him I would send an electronic encrypted copy of the documents,” Greenwald said. “I did not end up doing it. Two days later his laptop was stolen from our house and nothing else was taken. Nothing like that has happened before. I am not saying it’s connected to this, but obviously the possibility exists.”
He said he didn't send it but implied he wanted to so it's very reasonable to suspect he did later at some point.