I think you could make an argument either way and have an equal chance of being right. Either Trump et al get bribed/flattered/are personally exposed to the fallout and bail out their fellow class members or he gets angry about it and decides to make heads roll via his increasingly captured and controlled DOJ. I still agree it's more likely the former than the latter but I can see the path that leads to the latter.
It came out soon after AOL acquired Tine Warner in 2001 that they artificially inflated income to prop their stock up for the merger to go through. No one was punished for it.
"Heads will roll" just means "severe punishments will be administered". It doesn't necessarily imply the punishments will be illicit, illegitimate, or even fatal.