Seems ripe for civil litigation at least.
Even if criminal charges are a slap on the wrist, civil damages could easily get into the billions. And good luck finding a jury that doesn't remember the national outcry about egg prices back then.
I think the craziest part of the story is how brazen the execs were. Although what they were doing (price steering in an illiquid market) might well not be illegal, it pretty blatantly is in a grey (dark grey) area and they themselves obviously knew they were exploiting the system for themselves.