I dont think bitcoin will be use by almost all people in the year 2022, but one thing i know for sure ,china will be the first country who will accept bitcoin in almost all thier stores as payment options. And all of the people in china will now be using bitcoin.
when this year comes, i believe bitcoin is already famous. with the speedy internet now, am pretty sure people are now very much aware of bitcoin. nothing is impossible comes 2022.
In economically developed countries, after 5 years of possible fasting, everyone will use bitcoin after 5 years. And in dysfunctional countries during this time can only hear about the crypto currency.