Cell phones aren't the best example for you. As soon as economic and technical hurdles were cleared, cell phones became one of, if the most, rapidly and widely adopted technologies ever.

Cell phones also provided something genuinely novel and useful for those who adopted them, in a package that was familiar and easy to use.

Bitcoin, by comparison, okay I can pay for some things, well I could already do that. I have to adopt hard to understand security measures and my every action with my 'money' is fraught with peril if I'm not exceedingly careful. Well, that's new, but it's not something that appeals to most people.