the price is more than $740 now. I think the price will not go below $300 forever. It will only go below that level if there is a major crisis.
well there always is a possibility that bitcoin will be dumped to the prices of near 0, especially if whales start dumping their bitcoins really fast then all people would start selling
It will happen only when there is a fundamental flaw is found in the bitcoin or there is big split in the bitcoin community.