I think the bitcoin will fall because of RANSOMWARE,it is impossible/Difficult to track who did this and in futur Bitcoins will be considered as a motivation mean for such act
Bitcoin is not going to fall for such a small thing, this creates bad publicity of course, but think of it this way, windows machines are prone to get virus unlike mac and Linux machines and yet people keep using windows despite all the disadvantages, bitcoin will be the same, bitcoin will be used for bad stuff but most people will use it for good.
Also see that Ransomeware has no negative impact on Bitcoin, We did not seen even the slightest dip of price in bitcoins on the Ransomware virus. We are now seeing the all time high price of bitcoins and i doubt it will ever fall down. Bitcoin has been no longer a pump dump coins which cannot be dumped on negatives news or anything like that.