I don't know what will happen in the near future. But Bitcoin is much more popular today than it was back in 2015. Slowly but surely, people will understand the usage of Bitcoin. The new generations are getting interested in it. As long as it spreads worldwide, the government also minimizes its usage. But, due to it's nature, people love it.

It will continue to spread as long as people care about their privacy. Bitcoin does not have to be a dominant currency. If countries regulate Bitcoin usage, there is no point in using Bitcoin anymore.