Well, so far your theory remains a far cry from reality

Bitcoin has been rising and it will likely continue to rise in the future. If anything, it proves its robustness as a decentralized (read free of government control) currency. Using it for extorting ransom is a sort of real life stress test, but that doesn't mean in and of itself that this is the only field of Bitcoin's application. I'm in no case justifying such acts (i.e. encrypting file systems and then demanding money to be paid to decrypt it), but, as to me, the effect of that would be positive on Bitcoin in the long run. In other words, don't shoot the messenger, he is doing his best!