With over 50 million millionaires across the globe and 21 million BTC , what happens when every millionaire out there gets 1 BTC ?
Half of the 50 is 25 and they can all get the 21million BTC.
Rich people become richer because they simply continue investing and growing their company, not because they are investing in Bitcoin. And the truth is that Bitcoin is not for everyone and not all are holders, many are just doing trading which means that there is still a lot of Bitcoin available in the market. Unless all people who have Bitcoin will hold forever and never sell them that certainly, we can assume that 21million total supply of Bitcoin has been accumulated already.