I agree with $500,000 prediction being too high, even $100,000 is still to high. Gold is a 5000 year asset, no way Bitcoin will surpass it in 13 years from now, just not possible! Sorry, but it's nonsense.
Really 500,000$ is almost next to impossible for the bitcoin to attain such a price, not even in decade. We are only 1200$ dollars now and 500,000 is like a dream which may never come true. I think we should be realistic in predicting the prices.