I think there is a possibility someday that this dream will turn into reality all of us will become maillionaires. 1 BTC is $500,000 this is wow awesome. But its all depend on the demand and supply of the cryptocurrency coin like bitcoin when the demand is high there is a chance that there is a lot of buyers and investors. When the supply is not enough the price will go down. There is a thing called risk when it comes to this kind of money.
It might come true someday but it will take more time to get to that value and i strongly believe that it will gonna happen someday at least we are still alive to witness it. Bitcoin is the future if you are planning for long-term investment and this half a million dollar for a single Bitcoin will come true someday. Today it's just a dream that we keep on praying that might happen soon.