It may take quite a long time for the world to accept electronic money widely. I do not say it is not possible but it will take quite some time. Developed countries will be the place where crypto needs to demonstrate its ability further to ensure it has a larger development focus. If it succeeds in these markets, developing countries will soon become familiar with it.
Yes, hopefully developing countries will get on board with bitcoin and other cryptocurrency soon. However, I think there are a few developing countries now that are already using cryptocurrency, such as the Philippines. I do not know up to what extent they are using it but it is a start, right?