1st rule of market predictions: only ever predict the "what", "how much" and "when" separately. This prediction appears to be predicting all 3 together. Tempting to bet against it (although I don't partake in that kind of gambling)
Professor Bitcorn made that mistake by predicting Bitcoin would crash to less than $10 in 2014. He might not be a laughing stock if he had only predicted a price without a date.
If the dollar really collapses soon it's affect on Bitcoin would depend on if all the other major currencies also collapsed. If they all simultaneously collapsed Bitcoin would become a safe haven for investors like gold. If only the dollar collapsed investors would move their money into other strong currencies, and Bitcoin wouldn't become a major safe haven.