Price will higher at halving for sure, but to get rich with bitcoin we need to have huge number of coins but you can expect good profits from the coins that you hold.
Yes with halving we can get big profit and for getting more we have to buy huge number of bitcoin, but those people who cannot buy more bitcoin do not have to worry as with their small amount of bitcoins they can earn a better amount of profit and then with that profit they can start a small business, so they will also be rich.
It is all on the decision and technique on individual to maximize his earnings, it is not just necessary that when you earn money with bitcoins you will focus on the crypto world to improve our earnings but we need to see other opportunities in the real world to have more opportunity to earn. That is what you called diversifying your investments in different industry..