Well, the universe is likely infinite, so no, there's really no such thing as overpopulation on a universal scale. But talking about humans populating the univ

Well, the universe is likely infinite, so no, there's really no such thing as overpopulation on a universal scale. But talking about humans populating the universe is also meaningless, since the speed of light and expansion of the universe means we can't reach anything but a tiny fraction of it, and by the time we have the technology to travel quickly enough to even begin contemplating intergalactic journeys only a fraction of a fraction will be within reach.