of course there is a big dump coming there is absolutely no doubt about that, any coin that goes up based on pure hype aka pump (in this case fork pump) needs to come down eventually.

the real question is WHEN?
history suggests that the big dump will be initiated about 2-3 hours before the fork and it will lose a huge part of its value before the fork even starts. then there will be a bigger dump as soon as the fork takes place.