We can't say this thing right now because the future are still bright with bitcoin. Yeah, for now a lot of black propaganda just to ruins bitcoin reputation but I still believe in the future of this thing, bitcoin will become a major currency in the future. This is just the beginning.
For bitcoin to be a major currency it needs to be centralized by atleast one country but due to such volatile rates no country would take such chances fearing economic unstability , also bitcoin is not as secure as cash currency with so many scams happening around every now and then where bitcoin is directly indirectly involved. And yeah it was the Wanna Cry Malware which indeed made the bitcoins rates rocket flying a year back.