1. George Clooney didn't get rich from acting. He got rich from selling Tequila. Regardless, his children will likely remain wealthy despite never having been on a movie screen, much like the Waltons are among the top 20 richest people despite never having a job at Walmart.
2. Every year, fewer and fewer people get rich from having built something (labor), and more are just rich from being already rich (capital).
If in a free-market system, if you let the people with most wealth concentrate power, after n-years you are just left with a monarchy with a couple extra steps.