Childhood's End Transformation Quotes

How we cite our quotes: (Chapter.Paragraph)

Quote #10

At the end of one path were the Overlords. They had preserved their individuality, their independent egos: they possessed self-awareness and the pronoun "I" had a meaning in their language. […].

And at the end of the other path? There lay the Overmind, whatever it might be, bearing the same relation to man as man bore to amoeba. Potentially infinite, beyond morality, […]. (23.27-28)

Humanity's change makes it something that isn't human anymore. The Overlords transformed from their earlier species as well, but can the Overlords still transform, or have they reached a dead-end of evolution? And if they have, does that mean they'll eventually fizzle out of existence?