Will be a ruin for all who buy this month and also invest in it, but if this speculation becomes real it will be very profitable for everyone who does not have and will buy, when bitcoin prices go down. I feel 2018 will not change much, maybe bitcoin can go up or down to 1 or 2 percent.
Bitcoin price fluctuates by more than 2 percent per day usually. Today we are already down by 5.5%
I highly doubt that say the price on 1st of Jan 2018 is $4500 the min or max price on 31st Dec 2018 would be either $4400 or $4600.
I'd bet against it being in that range for sure.