The worst senero is that they can't read or write which makes it difficult for them to operate the internet since Bitcoin transactions are done on the on internet.they prefer to use the traditional paper currency they feel it is comfortable for them.
This is the major reason why Bitcoin and other cryptocurrency is yet to be adopted by the masses.
You see, people will re-invent themselves when money matters is at hand irrespective of their class and status in life. Literacy will never dictate the course of currency growth, and that includes turning digital. People will always adapt.
In fact, in many places all over the world, governments and charitable organizations started handing out ATMs to many indigent communities to secure their monthly social allowances. And this has been effective so far. So i am sure that should currency transform to digital form, illiterate members of the community will adapt well.
As banks have ATMs, Bitcoin (along with some top altcoins) does too. And the rest of atlcoins will surely follow suit. And this ease of access is already familiar to the community members you cited.