Generational wealth usually disappears within 3 generations so real life skills are necessary if the upper class wants to remain there.

Mate, I’m visiting Europe right now. The tail of generational wealth is so long here you can even see it. We can certainly see a few examples of family wealth being squandered. And it makes a great narrative about karma and balance. But I’ve met even more families that while not individually wealthy will never, ever be poor in the foreseeable future for the next 5 generations at least.

Karma? Do you believe anyone who has wealth only got that way through immoral actions?

That's an awfully long runway.

That severely depends on legal and social system you operate it. It is not universal truth, that was artifact some concrete historical period. And the loss is frequently result of large war, revolution, violent displacement, that sort of thing.