Well, if we're not talking strictly about cryptocurrencies, I think AI and related technologies seem poised for huge growth over the next decade or so.  AI already seriously affects many industries, and I think this impact just keeps getting bigger down the road.

Self-driving cars and drones, virtual personal assistants, smart homes, greater automation of industry and agriculture... I have a feeling that we will finally experience the future we have only known from sci-fi novels and movies.