There are many problems in the 3rd world country - one of the main issues is illiteracy and then the access to internet and there is non availability of smartphones to keep a track of the things. So the physical bitcoin won't be successful anytime sooner.
Well, that's kind of the point, isn't it? The purpose of the notes is to make bitcoin as easy to use as fiat without the likely abuse (debasement) by government officials which plagues fiat.