I don't see it coming below $550 and even there ain't any possibility for it to come near to $550 unless there is something strong that happens like a dump or an unexpected event takes place like some hack or DoS attacks...
550 is possible, but 500 is something I find hard to believe. If that price is achieve a lot of miners can't mine anymore which is terrible for bitcoin. So the whales make sure the price stay atleast above 550 dollar, because below that there is a potential risk hazard.