If the birth rate does decline then, yes, things may become better.  True, "Malthusian limits," as such, may not exist, but there must be theoretical population limits of some kind out there.  If you had enough people that there was no room to sit down, for instance, then you would have to agree that things had gotten out of hand.

When I worked as a police photographer in Las Vegas, Nevada, many, many years ago, we once encountered two men and a woman who were caught while involved in what I shall refer to as "intense recreational reproductive activity."   They were dirt poor.  No money changed hands, because they didn't have any.  They were, in fact, camping out in an abandoned building at the time, and were doing what they were doing because there was literally nothing else to do that they could afford.  The detectives let them go.  There was no point in arresting them.  But the thing that sticks in my mind is that they had not thought at all about diseases or possible children, or any other repercussions from what they were doing.  Morality, I suppose, is for those who can afford it.

I don't know the answers, but the questions trouble me.