There's no question about bitcoin's tendency to recover from even the worst valuations over its life, the question should be about if bitcoin would even go so low as to be valued to a single dollar. Volatile as bitcoin may be, for it to drop in that low of a value there has to be a global financial collapse in the cryptocurrency industry that would cause people to literally dip 99% of their investments and move it to somewhere else. We all know how improbable that could be considering the fact that more and more countries nowadays are becoming more accepting of the idea of bitcoin and other cryptocurrencies operating within their borders, and the slow but steady increase of people who actively use bitcoin in their daily uses too.