not only bitcoin would die if then there's no internet access , but also a lot of banks that operated with internet, a lot of public facilities that rely on internet as yeah nowadays the Internet of Things has begun . so for me it's more to universal disaster rather than bitcoin only who would die. the possibility this scenario happened also are so small let's skip that talk.
I agree, talk about post apocalyptic situation. Well for now internet is really a necessity, but if you think of it this way, the internet would really die, then we have to find alternate solutions for that.
In the post apocalyptic world we will eventually learn to adapt on what we have, that's human nature I guess. Therefore, we can live without internet.