Its just a matter of time really. The blockchain technologies are still in their infancy and not exactly easy to use for those who're uninformed
Whats fascinating is various countries in Africa such as Kenya are far ahead of much of the rest of the world when it comes to paying for things digitally. They seemed to skip much of the paper currency and moved straight to digital currencies for many things
3rd world countries indeed are faster with adopting to these currencies. That is mainly to avoid the need to interact with their corrupt governments.