The maximum numbers of bitcoin to be mined is 21 million bitcoins. Bitcoin can not be used as money by the whole world because it has a maximum cap. My opinion . What is your stand ?
The limited number of bitcoins of 21 million is not related to its possibility or impossibility to use it as a world currency. The impossibility of such use of bitcoin is associated with its high volatility. It is the instability of bitcoin that prevents its use as a world currency. If the price of bitcoin is constantly changing, the economy of the country will not be able to work normally. Therefore, bitcoin as money can be used only along with the usual national money of the state.