I think it's completely possible Bitcoin would be worth so much than the current price and that's why we shouldn't stop to accumulating Bitcoin when it's still cheaper.
Maybe one day in the distant future, but it's not really realistic to expect that by the end of the decade the price will reach some astronomical values that could turn a $50 investment into a fortune. Even if we were talking about the price of $1 million for 1 BTC, that means an increase of x50, and that means that the one who invested $50 today would earn only $2500 in the future.
If you add to that inflation and the fact that fiat currencies are constantly losing value, then you will not be able to buy much for that money compared to what it is worth today.