Why do Africans, and Latin America use U.S. Dollars? People use stable currencies with reliable, and predictable prices. The Euro being an important currency of modern economic trade would be a top contender for replacing the U.S. Dollar, and inflation shocks would be absorbed more easily as it would be dispersed more globally than locally like the U.S. For example, how Greece’s economy fell apart but countries like Germany essentially forced Austerity onto them, to keep global trade stable.

Also, does it say something about Bitcoin or does it actually reveal more about people that they would switch to the New Dollar? I ask this because if the limitation is on the part of the vast majority of people then there isn't much to be done on the technical side to improve adoption, we simply have to deal with the fact the millions would be ready to adopt the new version of "currency that just failed"

If the usd becomes worthless, holding other currencies is a hedge against that.