The human race has developed both mentally and otherwise to the extent of making versed research in getting more detailed information about the recent happenings in crypto more expecially Bitcoin and it's possible total adoption, this has over the time help both beginners and old folks in Bitcoin world to know it's benefits and also the right targetted period to invest in it and also the need to promote it as one of the most profit expectant Cryptocurrency.
The world is changing, things are evolving, and eventually, digital currencies will dominate the global financial system. Bitcoin will be used separately with fiat currencies in the near future, just as new technology emerges and the old fades away. I think change is constant and happens gradually, thus the fact that it is not currently recognized as legal tender cannot prevent it from occurring in the future.
Although the process will take some time, I'm confident that bitcoin will eventually be accepted everywhere in the world and recognized as legal tender. Even in remote parts of the world, the availability of internet is steadily increasing, which will assist to maximize its use.