Bitcoin is usually used by people interested in technology. I mean, persons with a certain technical knowledge are interested in bitcoin.
My observations are that way. I think Bitcoin needs to reach larger quantities. Can use bitcoin in people who are not interested in technology?
Can people use the bitcoin in the profession group like tradesmen, teachers, housewives, firemen, butchers? Are we going to see the days that these people use bitcoin?
first there needs to be some place they can "use" bitcoin at. if we want to talk about usage. then if there is a place to use bitcoin just the way there is a place to use credit card, even if "regular citizens" don't understand the technology behind bitcoin they can use it with their phone Apps, with their third party services that make it easier and so on.
Merchants are pretty happy to accept bitcoin as payment if and only if their customers will demand on it. On the other side bitcoin technology is easy for everyone who want to learn. People learned to use facebook, and instagram why not learn to use bitcoin? If they don't can stick with favorite inflationary fiat money and let the technology to overtake them.