Population size isn't much of a concern right now so idk what OP is talking about, but I doubt population size is solved. Natural selection, in absence of premature death, selects for those that give birth the most. So while at the moment, we are in a sort of lull, eventually the people who have a low birth rate, will be selected out of the population. The only way this doesn't happen is with another force acting in the opposite direction. For example, maybe whatever is causing the birth rate decline now, actually counters the incentives of natural selection over hundreds or thousands of years, or the population exceeds the carrying capacity of the Earth such that premature death becomes common once again.

>So this whole random idea of overpopulation is alarmism over nothing.

Underpopulation is what I was referring to. Some countries have extremely low birth rates, and stabilizing them is important.

Regardless of the source of the problem, the end result is the same: not enough people. Cloning treats that symptom even if it doesn't address the source. But yes, you're left with a new problem: who will raise these new people? If it came down to it, the state. Or the state would assign children to couples.

If the clones are wards of the state, then an industrialized/automated approach to child-rearing becomes plausible. Yes, this is dystopian. But if we're going to do it, we should use the Montessori model, with each cohort helping raise the next.