We just cannot say how many years exactly. It would be more of "it will take more time" before people, if not all, at least most of the population, will use cryptocurrencies. Though it is now somehow evident that there are already a number of people from all across the world who are using cryptos, there is still a lot to work on. I mean, the mass adoption of crypto still have a long road to take.

But, I think we can see positive news regarding crypto because there are more and more establishments which consider cryptocurrencies, especially btc, as a mode of payment for their services. If this continues, then our wait will soon be over for crypto's mass adoption.