what if someday when bitcoin has become the main payment instruments in the world. and how when the Internet network paralyzed. it means that we all can not perform various financial transactions? , is there any solution ?
I think if bitcoin has become the main payment tool in the world there's no need to transact on the internet, and if then the internet is totally dead it does not matter, because bitcoin has become the primary means of payment in the world and means our days in real life are easy to sell or buy with bitcoin. So, no longer need to access the internet.
I guess you didn't get the OP very well and I will advice you to read back and edit your post maybe. How can we use Bitcoin without the Internet? It's rather the internet that helps us facilitate Bitcoin payments that's why it is vital in our lives and the OP is assuming hypothetically that if it is switched off somehow by whatever means what will happen to Bitcoin.