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
How will Bitcoins fall due to ransomware if you are indicating that it can get a bad name cause of money was demanded in Bitcoins or that bitcoins account will be hacked and people will loose money? If the former than earlier it was demanded in Fiat, Fiat is yet used by all. If the former it's difficult to hack into Bitcoins, it's highly secure. So I don't think there will be any effect whatsoever in the Bitcoin market.