Dollar is a popular not just popular but a powerful currency. It is very known world wide. Some country also depends on US dollar, making it powerful, so i don't think it will happen soon. Maybe someday but not so soon.
yes that is right that dollar is too much popular as well as powerful but it is only because of its users,
if people will stop using dollar i do not think that it will even survive for some time. in fact the young generation are now changing their interest, most of them are now using online facilities for shopping and for so many other activities. so i am sure that if this trend will continue for a long time then dollar will really become devalue and people will mostly give preference to online currencies
If ifs and ans were pots and pans
Then there'd be no work for tinkers' hands, as the old proverb goes. Why would people want to stop using dollars unless the dollar gets devalued massively? People are using their bank cards to pay online, but the balances of these cards are still counted in dollars (or some other fiat currency), it is just a new and flashy method of payment using good old greenback. Even if you are using a Bitcoin payment card to make purchases online, payments are still settled with some fiat currency, most likely with the same US dollar