@LuckyGuy Don’t quote me, but I think no. If I recall correctly, sickle cell anemia is caused by mutation, and the gene is recessive; ordinarily it would be bred out of the population. However, because it confers an advantage for people infected with malaria (they experience much less severe symptoms), it persists in parts of the world where malaria is very common.
Ah – this from Wikipedia:
“In the USA, where there is no endemic malaria, the prevalence of sickle-cell anaemia among blacks is lower (about 0.25%) than in West Africa (about 4.0%) and is falling. Without endemic malaria, the sickle cell mutation is purely disadvantageous and will tend to be selected out of the affected population via natural selection.”
So, it does look like the gene will eventually become very rare without the advantage conferred by malaria.