I'm not sure every people will use bitcoin in 2022, maybe only 5-20% from all people around the world that will use bitcoin in 2022. But if in 2022 the bitcoin's price is so high, i think it will make more people use bitcoin on that year.
If price is too high at that time then I don't think many people will able to afford to invest their money, so if you want to invest then this is the right time to do.
Of course with the current price it is cheaper because we don't have the volume yet that would make the price stable, investing is very risky but if you believe we will gain massive adoption buy 2022 then buy now.