One thing that I think should happen is mutations in inbred lions. I say this because some people really want a lethal mutation but don't have the Silver Beetles or Golden Beetles to afford one, I think this should happen so that the chances of getting a lethal isn't as rare and could become a more common thing, because in real life the causes of incestuous relationships or inbreeding within members of the same family, causes all kinds of rare genetics and mutations, and syndromes, so I think that the game should add this feature.

Edit:

Before y'all jump me, this is just my opinion, I know that it will never be a gameplay thing unless stated otherwise