I think it will take a very long time for Bitcoin to be used by everyone in all countries of the world. my suggest is maybe for the next 20-30 years. indeed there are many surveys that show an increase in bitcoin users each year, but this applies only in developed and developing countries. in fact, in poor countries and some developing countries still prohibit the use and all bitcoin transactions. but I'm sure bitcoin users will increase if the government (a country) plays a role in cryptocurrency