is bitcoin more popular than US Dollar ?
Not right now of course but give it 10 years you may find then that bitcoin has risen to an area that either rivals USD in popularity or has gone past it. I think it takes at least 10 years to progress to this feat.
I don't see that bitcoin will ever surpass USD, USD is currently in the trillions, I think about 10tn, whereas bitcoin is not even close to 1tn, it is such a large increase, bitcoin would have to have a price of about 500k to rival usd.
Total supply of bitcoins is currently lower than 21 million. The reason is that most users have forgotten their private key, of course, the amount of bitcoin can not be released. In addition, Bitcoin core has up to 2 million bitcoins, and shatoshi nakamoto has silently exploited up to 2 million bitcoins in the first blocks. About 10 million bitcoins remain. What do you think about the value of bitcoins if they keep forever the amount of bitcoin? I think bitcoin will continue to increase.