Genetic lineage eveloves through natural election, Social lineages do not, since the idea of a social class is based on intergeneration peservation of wealth, power and privledge. This creates less pressure on the linage to adapt, since it is already in equilibrium with its artifical environment.  Furrthermore wealth insulates these lineages from environmental challange. Over generations  these lineages become less fit  The genetic linage of poorer people, on the other hand are challanged by the constant pressure to survive. Over generations this makes them fitter Eventually the rich will be trapped in an artificial world that, when it breaks, they have no idea how to fix, and a world that they have no idea how to live. Survival of the fitest.