The movie does not explain whether the new species can reproduce. The female protagonist asked the female doctor how she came to this world. The female doctor said that after the mother was infected with the virus, the baby was not born, and it bit out of the mother's body. That is to say, even if the new species can reproduce the next generation, the mother will die when the newborn is born, that is, a pair of new zombies will have at most one child. It won't be long before the species that emerged to replace humans will slowly become extinct.
It is impossible to say that an imperfect species can replace human beings. At best, they will destroy human beings.
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