Surely we will tire of it, and even if we don't, we lose the pleasure of anticipation. If, for some unforseen reason, everyone suddenly loses their taste for THE chocolate cake, it will surely go extinct. To have the potential for evolution and adaptation, we must risk the possibility of the bad. However, if we remove the diversity we lose the potential for evolution and for surviving unexpected change. To have the potential for evolution and adaptation, we must risk the possibility of the bad.
Geneticists call that cost genetic load .
In most populations, every individual carries a portion of the load three to five bad recipes out of several thousand. The load is so well distributed that if two individuals compare their recipe collections they will generally not have two copies of the same bad recipe. Loss of Diversity Suppose we start a new population with only six or eight founders. We will get rid of hundreds of bad recipes, but the remaining dozen or two will be encountered much more frequently. Furthermore, if there are several good or excellent recipes, the chance of dropping one of these from the collection grows greater as the number of founders diminishes, and the risk of losing one remains high as long as the effective population size remains low.