i think there is a problem which assumes bitcoin should be a widely adopted currency, used by the mainstream . This problem is large, but solving  is easy. Most people only need to know how to use it. All currencies are complicated, like dollars, but once you use them a few times it feels like second nature. People will be a bit awkward using bitcoin at first, but they will get the hang of it. Most people don't know how U.S. dollars work either, they just know they can spend them, how to spend them, and if they are lucky, how to make them.

Another big problem is that governments can't control bitcoin like fiat currency. They can't print it up to go fight wars whenever they want (could be a good argument for bitcoin bringing peace). This is a problem because it's made bitcoin even more volatile, made bitcoin out to be a house of cards that the government flick over with one finger. The government is the elephant in the room full of bitcoin.