I would love to see a majority of the population using cryptos. Even a significant minority using them would be amazing. But given the fact that Bitcoin is the most popular, and its high fees make it a bit unfriendly to newcomers, I think it will take some time.

Granted my coworkers have recently started buzzing about Bitcoin, to my amusement. Until theres a way to pay with crypto at your local fast food joint, supermarket, and gas station, mass adoption will be slow. Only the crypto OGs, tech lovers, capitalists and forward thinking populace will be involved for the next year or so I think.
I think maybe by 2020 crypto will be second nature to everyone.