Is simultaneous hermaphrodite species stable?

I'm writing a story set in the after the end world scenario. The very few humans who survived the apocalypse in the facilities deep underground, decided that human race is too self-destructive and violent. So while waiting for radiation levels to drop they've genetically engineered a new humanoid species of simultaneous hermaphrodites. The hermaphrodites are human females with additional functional male sex organs, like futanari from anime. Fast forward a few centuries in the future and humans are extinct, nature took over the remnants of human civilization like in Life After People. The hermaphrodites are the most intelligent beings on Earth. They live in tribes and their technology is on the level of the native North Americans before the contact with the Europeans.

Would the new species stay hermaphroditic on their own?

I'm afraid that stronger and more violent will specialize in being males, while weaker will specialize in being female, and in few generations there would be two sexes again.

As per my understanding of evolution, please correct me if I'm wrong, all it's needed is that hermaphrodites who specialize of being males have better fitness then egalitarian ones. Then their numbers will grow until they get to 50% when the rest will simply specialize in being females since that's the more rare sex.

I'm hand-waving how the humans genetically engineered the hermaphrodites. I assume they had knowledge and resources to do it. However those things are gone in the present of my story.

posted about 6 years ago

FutureIs‭

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