You're right! I definitely agree on this. It is not being more popular because definitely, USD is still more popular nowadays. But when we are talking about a currency that is more safer and pricier, bitcoin is better than USD. Bitcoin can be invested at the same when you have it on your bitcoin wallet. Though USD is more popular still around the world because people has no enough idea what bitcoin really is until now, I think there will be come a time that bitcoin will be better known and used in the future, which many of us hopes.