If constantly creating a system that sorts out the poor, makes them less socially mobile, and less likely to have kids. A society is created that has people from higher classes, moving to lower ones. A a pyramid can’t stand without a base.
If you create a society where people can easily improve themselves, feel optimistic about the future, and want to create something that benefits society and allows them to move up in the world. Then you are in a world where people are moving up in class.
In reality, both are going on all the time. It’s the net trend of positivity that needs to happen.
While this could get political, people can affect this on an individual level. It’s one of the reasons that I work on this blog, my email list, and give talks. I want people to move up in the world and be optimistic.