The value of bitcoin is the entire physical wealth of the world divided by the market cap of bitcoin. The altcoin is worth all the abstract/intangible value of the world divided by their market caps.
That wont happen, even Golf is not sold at such an amount $1 million dollars, gold is below that. I dont see any reason for Bitcoin to be sold at such rate. It can never happen but if they try to attempt such through speculation, then its over, everything is completely over then. Well, its only all these greedy fools that think they will become the world richest men that brings up such idea/topic, but it wont happen, if you want to be world richest man, then go out there and hustle for it and dont expect it from bitcoin. When all Bitcoin is mined, I believe it will have a stable price just like gold.