> It is not currently run in a sustainable way. It can be

Can it? That remains to be seen. So in the meantime I would say we are already overpopulated.

To be fair, your statement probably means that we have the resources and technology to run the world in a sustainable way, and I would agree with that. But then we also likely have the resources to end hunger, poverty and war, yet those have never been the world’s priorities.

When will it be a priority for humans to run the world sustainably? Who knows. But right now it’s definitely not sustainable.