First, we categorically lack the technology for wide-scale colonization of space or other planets. Second, no matter how much people like to deny it, the Earth does have some finite carrying capacity. We can argue indefinitely about what exactly that carrying capacity is, but it exists. It follows from those two facts that unbounded population growth is not possible. A continually shrinking population eventually leads to extinction, thus leaving a stable population as the only option that doesn't lead to either extinction or widespread chaos and calamity.
It's not really clear to me what the point of this question is. Are you advocating for infinite growth? For eventual extinction? Perhaps for a slow, long-term contraction but not extinction (i.e. eventual stability)? The latter is certainly what makes the most sense to me, but I'm just some random guy on the internet.
No hostility intended. No human being is a completely blank slate. Asking such an open ended question on an internet forum strongly implies that you disagree with the premise of the person you're responding to. Explaining if/how/why you disagree can lead to a more productive conversation.
It's not really clear to me what the point of this question is. Are you advocating for infinite growth? For eventual extinction? Perhaps for a slow, long-term contraction but not extinction (i.e. eventual stability)? The latter is certainly what makes the most sense to me, but I'm just some random guy on the internet.