As the saying goes, good things never go out! Then why don't many rich people become poor? Isn't it that extremes meet? Is this sentence wrong?

The extremes meet, that is to say, we have reached the peak limit and can't improve any more. Nature is in the opposite direction. Because many rich people do not reach the richest level, when they reach the richest level, they will slowly decline or be in a state of shock. It turns out that there is still a saying that there are only three generations of wealth, and no one is always rich from generation to generation. Many rich people in past dynasties have this result. So this sentence is correct.