I am facing a real world issue that prevents me from using Bitcoin.
I live in Pakistan and for last three days cellular internet service all across the country is suspended because of prevailing law and order situation. Internet is working on fixed line connection that is reaching homes. So there is still some connectivity available.
If government shut down internet service even on fixed line connection then there will be complete internet blackout in the country and in that situation we cant use bitcoin.
I think this is also one of limitation of bitcoin that we need internet to use it.
You are very correct because this is one of the limitations many people that are leaving in the rural area are facing right now and if you tell them about Bitcoin and how it works, they could cry to you that they don't have a constant access to the internet and it a major problem especially when connectivity is partially available to them. The people in this kind of environment are mostly left to leave there lives without the need of the internet.
If there there ways Bitcoin can be process even with the access to internet, this would have facilitate the huge adoption of Bitcoin but I don't think Bitcoin can ever be transact without the use of the internet.