They have already paused trading during periods of high turmoil. When bcash was announced, for instance. I think that actually set their standard for "open the market in 'post only' mode for a period before actually starting trading".
[0] https://medium.com/@jonaldfyookball/why-some-people-call-bit... [1] https://en.wikipedia.org/wiki/Bitcoin_Cash
Bitcoin Cash came from a minority group (big blocks) in the Bitcoin community.[1]
[0] https://en.wikipedia.org/wiki/LibreOffice [1] https://medium.com/hackernoon/the-great-bitcoin-scaling-deba...