The Bitcoin “value overflow incident” on August 15, 2010 is probably the closest thing and that didn't affect the price much (though one BTC was around 8c at the time)
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."