Put another way: you are thinking in the extreme short term. In my opinion any crypto-currency, no matter how good, will fail in the next 20-50 years. Modern computers are simply too insecure to handle a cryptocurrency. I predict that secure, proven correct on pain of liability, computers of equivalent complexity will take generations (or about 150 years) to develop. IMO, due to the 1996 WIPO 'Copyright' and 'Performances and Phonographs' treaties*, computer security has been regressing for the past 15 years.
I disagree. We have all of the building blocks to make a truly secure language/operating system. I actually hope the rise in popularity of crypto-currencies will spur investment in new operating systems that address these problems. Windows, Unix, and OSX are all based on 40+ year old technology. It's the huge amount of infrastructure and investment built around these old OSes that is holding back progress. Not only is a secure operating system (one free from viruses, malware and the like) possible to build, it's not even terribly difficult (but it will take a lot of effort and require a large amount of investment that might require many years to recoup).