The point is in case of Internet blackout we have no access to bitcoin.
Well, if there's a total internet blackout, I think you'll have bigger things to worry about than not being able to access your Bitcoin.
Internet access is the basic access of human rights. Without it, there will be no 'information'. I do agree there is a bigger thing to worry about and be concerned about rather than things like Bitcoin. I did not mean to discredit Bitcoin, but if basic things like information access are limited and prevented, it has more urgency to be addressed and in regard to shifting the blame to bitcoin, it is rather not on point.
Others have given solutions about 'off-grid' solution to send bitcoin transactions, but in essence, it is not a bitcoin limitation since it is just how it works.