Impossible. Just try to think of this, butcoin had some difficulties just to reach a market value of 8000USD, so what more with a value as high as 500 000 USD within just three years? I do believe that the market value of Bitcoin will be more expensive in the future than now but it really seem to be absurd for its value to rise to 500k USD in just a short period of time. Indeed, the rate of increase at this moment is high but Bitcoin is still volatile.