I think you’ve raised a valid point. However, as Naval Ravikant will say, “Wealth is positive sum.” Unlike money that is zero-sum, wealth is positive sum.
The wealth of today exceeds that in existence about 50 years ago. If we are to extrapolate over a larger period of time, it will be more obvious. In order to fully grasp this; you can consider the standards of living between now and then.
We really do not know the metrics for future wealth yet. So to answer your question; to some extent, everyone can attain financial stability.