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.
The speed of the Internet wouldn't make people study about bitcoins. As a matter of fact, with better speed of the Internet, you're going to be more distracted since you can download HD movies, play online games with no lags, etc. There's tons of distractions on the Internet. Someone who has a slow Internet connection will not be able to do all this and learning bitcoins don't require fast connection. The latter might become even more interested about earning money online since what he can only do is search stuffs and read articles. He can't be preoccupied by the aforementioned distractions of the Internet.