I don't think there is any realistic chance for bitcoin to ever reach the value of 0 USD. Right now BTC is around 20,000 USD, going down to 0  from such high levels would never happen. As soon as there would be a decline of the bitcoin price to 10,000 USD investors would start buying heavily again. Same goes for the 1,000 USD barrier. Who wouldn't sell everything he has to buy bitcoin below 1,000 USD. I am sure at such low levels investors would take out loans just to buy more coins. The only chance I see for bitcoin drop so low in price would be if there were technical errors at the exchange and they show wrong prices.