How much money are in the world? And how much money can Bitcoin be worth? in comparation to that.
Are you talking about the total supply of fiat money, or are you talking about the total wealth? The latter includes assets such as gold, real estate and treasury bonds. The total fiat circulation is around $37 trillion (close to $90 trillion if you include bank reserves and deposits). The total wealth is around $300 trillion.
It is impossible to say how much money in the world and what will be the final price of bitcoin. When the whole world start using bitcoin as their regular money in the markets for their daily needs then nobody will calculate its value with any other currency. Bitcoin will be the only usable currency in the world and there will be no need to calculate its value.