I don't have a concrete answers since I know there isn't one authority that "shut off the internet" and it seems we are passed a 51% attack. I don't know how it can fail. Seems like it has already succeeded. If somehow the limited supply or security of Bitcoin is compromised, I will let go of it. Just don't see that happening. It's always what you don't know though that gets you. 🤷‍♂️