to be fair, jeremy rubin floated the idea (as often happens after an event like this, like when mark friedenbach did the same after the bitfinex hack). not CZ. CZ just responded to jeremy's twitter post. it wasn't like CZ was intent on rolling back the network when the hack happened. a bitcoin dev just floated the idea and he fleshed out the idea in the hours following the hack. he probably should have done so in private rather than his live periscope.

obviously the idea was not well conceived or received so it was scrapped fairly quickly.