I don't think converting bitcoin to naira is an issue, there are platforms or applications that can do that. Even if you can not convert directly from bitcoin to naira , there are proceces through which your bitcoin can be converted to naira. For instance, you can decide to convert your bitcoin to usdt and convert to fiat currency. Furthermore there are some traders or biz men that still accept bitcoin.This is because they see it as a store of value, the more you keep it the more it adds value with time.