I think that it will already be used by everyone in 2020. In 2 years a lot can happen. Because bitcoin is only growing and growing. More people are starting to use bitcoin. And when the world will see what is happening with bitcoin, everyone will buy it.
In 2 years a lot can happen, yes. But that does mean that everyone will just change their perspective and think of bitcoin differently. Some people have not even heard of the term itself. Some have heard of it but then realized they are better off without it. People are too caught up with life these days that they barely got the time to think and learn something new. People might be thinking that bitcoin is one of those technologies that rises and then easily consumed and forgotten by the society.
Let us get real here. There's only more than a million users in this forum. People have alt accounts, tons of dead accounts, and tons of brand new accounts that have no post at all. This leaves us with a couple hundred thousand of users. That is a really really small percentage of the total population of the world. For everyone to start using bitcoin in 2022, every single day from now on should be a revolutionary day for bitcoin. Every single day should be owned by bitcoin. The Internet should be owned by bitcoin. Not "own" in a way that the bitcoin community has bought the Internet but in a way that bitcoin is getting so hyped that anywhere you go, you will find it. Sleep today, wake up tomorrow. And see that not much has changed and still a very small percentage of the total population is using bitcoin.