I get the part of no one being able to promise anything although I personally believe that bitcoin price will go down and will come up again as it did before. However Crypto currencies are not useless it just depends on what use they have for you. As I mentioned on my previous post even if for example bitcoin would not give me any profit reward and would crash in value I would still use it for receiving overseas payments as it would still be faster and cheaper than using banks and other third parties. So in my case I have use for bitcoin and the blockchain. Crypto is not just about investment there are other advantages, but what works for me and it is of use for me cannot be for everyone as we all have different agendas and needs.