This is a known fact if the price goes up it will surely go down. What happens if the price of Bitcoin falls to $1000 in 2018, will this be considered as a Worst Case Scenario or something else?
The worst case scenario would be USA banning all bitcoin related moves.
Back in the day when gambling was legal in USA for online gambling poker websites those websites made ton of money and one day FBI decided to seize all the casinos because of money laundry reasons and all that and all of a sudden those websites got blocked in USA and they had to move overseas.
Of course the big boys stayed and still hang around but nothing even remotely close to what it used to be. So we should hope the god that USA won't somehow ban bitcoin because if that happens than we are all screwed, that would be the worst thing that could happen in bitcoin world.