I think you are missing the point. Imagine you magically added 20 billion more people to the planet overnight. They would still all be individuals with dreams and ambitions, and so on. But that wouldn't stop the fact there is no way we could support them all.

I don't think surplus population is the issue (in the present) because we do have enough resources for everyone. At least to give everyone a decent standard of living if not a first world one. And the way population growth is declining I don't think it will become a problem. Not the real problem anyways.

However yours is a terrible argument against overpopulation fears. It is possible for there to be too many people for the world to support, regardless what you think of them as individuals.