If that situation happens then it must be the worst thing for this market. Anyway, people are waiting for the market to recover next year with lots of positive news coming.
It will be terrible only for those people who sincerely hope that something will change in 2019, and if they dont get what they want, they will obviously be upset. I advise you not to wait for miracles from the market, there will be something to be, get ready for everything.