Such a thing will never happen in the US. Too many people will be against it. Look at the anger of many people because the "government" is forcing them to wear face masks. They believe that they're trying to take away their freedoms. They will look at a move such as facing cash out in a similar light.
It depends on the country, there are many first wold countries in which cash is barely used while there are countries with similar economic power in which people still prefer to use cash for their transactions, however as times passes and the older generations begin to pass away and begin to be replaced by other generations I think we are going to see an even bigger decrease in the amount of cash that is used but even then I do not think we are ever going to see cash to disappear completely.