Even if there was the chance of a potential rollback again in the future (and the odds of that are slim, lets be blunt it is being blown insanely out or proportion for an event that happened once),
a potential roll back isn't really the problem because that is only a temporary disruption to the network.
the bigger issue is not rolling back.
if an exchange gets hacked again and someone manages to buy, borrow or steal enough coins to get them over the 51% of staked coins mark and the devs do not step in to roll back and force them out, then they will be able to fork the coin endlessly.
in other words.. perpetual roll back and double spend... also known in the fiat world as perpetual chargeback.