which is a problem if bitcoin is used up then the miners will play their fees as they wish, and the fee may not go down
if there is no solution, maybe people will actually move to the altcoin because bitcoin makes no sense in it. bitcoin can still live, how to turn it on is by using bitcoin as a payment method in every purchase of any item. And remember, at that time the price of bitcoin will scratch the sky, this is because of the scarcity of supply.