The total amount of coins that can ever be mined is cemented into the protocol and cannot be changed without full consensus from the people running the

protocol/code. This will never change, because it will decrease the value of the coins already mined. Who will want to do that, if it decrease your profits?

Just imagine you own 10 bitcoins and it's valued $400 per bitcoin now... if the total supply change, that value will go down, because more bitcoins will be

entering the supply.