Why do you think there's a law that will make it happen again? A large, empowered middle class is a historical anomaly, not a law of nature.
The question is, if we're going to erase that anomaly, what can you do to be among the winners?
Every good thing society has accomplished is a "historical anomaly", by definition. History is very large, and very miserable.
To quote David Graeber by way of "Can't Get You Out of My Head": The ultimate hidden truth of the world is that it is something that we make, and could just as easily make differently.
If the elite class decides they are going to checkmate all others, winner take all, the smartest play is probably to flip the table.
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Spot the American.
The sensible and moral action is to ensure that nobody loses instead of "got mine fuck you"