I think no more than 5 million people in the world will use the bitcoin regularly in 2022. The block size is too small.
hope that in 2020 only in Pakistan more than 5 million people will be using bitcoin, the ration of entering the people in the world of bitcoin is so high, more that 20 million people will be using it in China, and what to say about Japan India Russia and so many other countries, therefore i can aspect that the user of bitcoin in 2022 will be in trillion,