I think this is a well thought out argument and in many ways, I agree with what you say, but, it would then follow that Bitcoin and crypto would also be worthless as there would be likely no coherent internet. If the whole of big business, government and banking collapsed and humanity became more sovereign, why do so many people assume the internet and all global communications networks will stay running? Not to mention all our phones and gadgets.
With a breakdown as you describe, there would be a return to the dark ages. A better alternative is needed.