2016 is already a lot of people using bitcoin. and I believe, in 2022 at least 50% of people in this world already know what it bitcoin. bitcoin will become a medium of payment globally in 2030. it is my prediction.
I think it's to much. I don't think 50% of people in this world will use bitcoin in 2022, if the development of bitcoin is good, maybe it might happen. I think 30-40% in 2022.