a possible future is where blockchain will be used for every day to day operations- under the hood- from handling our communication, automobiles, security , loans, identity etc. Surely there will be a lot of blockchains but only a few dozens of them will be widely used and there will be advanced private blockchains networks that won't ever come to the light of public[classified]. I dont think the technology or the idea it represents will go away, it just can't .