How low would Bitcoin have to fall before it was no longer recoverable?
Price, in my opinion, would not dictate this. It would have to be something that would destroy the foundation and system on which it is built.
what you say?
Yes, I guess you're right. I honestly can't think of an event which could potentially lead to Bitcoin going to $1. Or actually not: I can think of many such catastrophic events but in case it happens you wouldn't care about Bitcoin price much. Like for example nuclear war or asteroid hitting Earth, alien invasion etc. In most cases, an unexpectedly long internet outage (like from a powerful solar flare for example) may lead to Bitcoin dropping really low, I'm just not sure if it could reach $1 but that would be nasty.