"...quite a few years off before it becomes mainstream."
It could be sooner than we think. With platforms like Steemit, it's very appealing to people like me who were aware of crypto from its inception, but are late adopters because well, it's got a bit of a learning curve. I still don't understand all the workings of it, but it's gotten a lot simpler to be a part of it in recent years.
I am currently working with a company that is launching a new platform in October 2017 that will combine a huge number of social networks and blogs in one application. It will reward users in a new crypto token just for participating. They will most likely launch first in the Third World.
If you want to know more, I did a quick write-up that includes a link to the whitepaper. - http://bit.ly/2uVkvCI
I think platforms like this and Steemit will drive crypto mainstream. There are a ton of people looking for ways to monetize their online activities, and crypto is one of the best in my opinion.