But I am pretty sure every internet user will be using or have used bitcoin at least for once. And its great enough.
This will be a great thing if every internet users will be using bitcoin in the year 2022, this must be the OP's topic because non-internet user will never have an access to bitcoin and it's network at this point and maybe until 2022 unless bitcoin network can be broadcast to other medium that does not require internet to connect.
If you do that you will understand why I say that the prediction is too unrealistic and I think it will never happen that everyone will use bitcoin because not all people are primarily living online.