Predicting something this wild needs lots of guts I must say. Yes 100k price is still acceptable, but 500k is really too high. If by chance also bitcoins reaches 500k, then I am pretty sure that many will still buy it. The reason is pretty simple, bitcoins are limited in numbers and the prices are increasing day by day. Hence more people will buy it at current price and will try to sell it later to yield more profits. Hence the price doesn’t matter at all, as the supply is fixed, hence people will demand to buy always.