I do not think so, because bitcoin is not yet known by the whole country, if it has entered a country, the country has not yet recognized bitcoin,and there are still many countries that prohibit bitcoin as a means of payment in any form..I think the dollar is still the strongest
There are many different theories about which is the strongest currency in the world because dollar claims to be the strongest currency whereas now the major portion of the world trade isnt being done only on dollars. Likewise, Euros and Pounds are also struggling after the Brexit and now China is also replacing Dollar with Yuan in the trade with different countries so, now there isnt one strongest currency is the world.