Of course it is! Much like how the only species that last are the ones that reproduce, any lasting system has trended towards the solution that is stable. The systems that didn't trend towards stable probably fell apart.
It wouldn't be the status quo if it wasn't self-preserving.
The interesting thing here is that we've demonstrated that the reason the status quo is self-preserving in this case is not simply a lack of access to marketable skills on the part of the poor.
Of course it is! Much like how the only species that last are the ones that reproduce, any lasting system has trended towards the solution that is stable. The systems that didn't trend towards stable probably fell apart.
It wouldn't be the status quo if it wasn't self-preserving.