I dont think blockchains survive because people still are attracted to fiats than btcs. I too am a btcsian but the truth cant be denied
If this is truth for you, then you must be from some other world because here, on earth people are really amused by this new blockchain technology and doing well with its outcome in the form of bitcoin. People are in reality tired of dealing with cash. It is most of the time not feasible for them to carry too much cash with them and the transactions are also not possible at once if the cash is too much.