I'm not so sure about that unless the country itself or government recognized bitcoin or if it will be teach on a learning institution. Mass adoption will come but I doubt that all people will ever use it, not all people can even own a cellphone at least or even buy a hardware wallet.
That's simple truth and must be told. For now am not seeing mass adoption in respect to Bitcoin but what we have seen so far are early adoptors, there are still many individuals who doesn't have the ideas of operating a cell phone, many have not the technical known how to technologies and it will be very difficult for them to adopt Bitcoin. But the good thing is that, those.who have adopted Bitcoin are those who have the technical knowledge and more ofthis categories are adopting day after day. One thing is sure, Bitcoin will be in the hands of everyone in the nearest future.