Yes. Those most suited to survive, will survive, on a statistical basis. However, I think there are a lot of niches, here and there, which depend on particular environmental circumstances. A general breakdown in society will kill most of these niches off. But, no doubt, enough will survive to bring it back to fruition when environmental factors once again become favorable.The sign of a strong society is its ability to protect the weak and marginalized, it all adds to the gene pool.