What happens in the future, no one knows. But one thing is for certain, BTC is going to go up in terms of fiat currency.

Because the same question has been asked every few years, during halving and during bitcoin network clogging. At any point of time in the past, consider yourself the owner of a certain amount of bitcoin, and then advance a few years and see how much you own in fiat for that BTC.

The answer is easy, you keep getting rich in terms of fiat.

Mining will only be for the fees if the people see that end of BTC supply. Most of us here will not be there when that happens. Better to teach your next of kin early.