In theory nothing prevents that but it would be so contentious that the backlash (e.g. 90% drawdown) may be even worse than just letting the hacks stand.
That said, I don't know how you could even do a roll back, you're not rolling back to a 'safe' state since the keys aren't safe at that point.
However in terms of the hack, Bitcoin is slow - most exchanges require a few confirmations so it's 30+ minutes to land a deposit in Coinbase/Binance at minimum, and a transfer that huge would instantly set off alarms. Seems unlikely that they would be able to unload that much.
"If you're first out the door, that's not called panicking."