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 ?
Irrespective of the number that how much it can be mined lets say 22 million but still there are other ways and factors in which bitcoin can be used. Bitcoin is very sustainable crypto currency and bitcoin can be use in other ways other than mining also. Bitcoin is a type of crypto currency and is a circulating crypto currency and lets say if if it has reached maximum point then it can be circulated among people and it is a type of crypto currency that can be use by the entire world.