I do not think it's a problem, I think overconsumption, inequality, and waste of resources is the problem.
However, the belief in overpopulation is very popular right now and has been for a long time, both in the general public and within academia. The kind of population decreases the Malthusians want are not feasible by birth control. Malthusians often say that if we simply educated women and poor people (appeal to the humanitarian crowd), our population would decline to reasonable levels and the Earth (again, an appeal to people who are caring and socially conscious) would be saved.
The reality is, even if humanity stopped producing children completely tonight, 50% of the world's population was born in 1983 or later, and thus it would be 50-60 years before enough people died naturally that the population would decline from 7 to 3.5 billion. It would take another 20 years or so to get that down to 500 million. Obviously, this rate of decline isn't nearly fast enough to achieve what Malthusians want, unless it is coupled with a great reduction in consumption, something we can do without forcing people to no longer have children.
So the reality is, no matter how much elite Mathusians and academics make it seem like their population reduction plan can be done humanely, the fact is, if they don't already intend mass murder, they will do so eventually if allowed to. And I doubt that the people who will be spared will be chosen by a lottery at random, I am pretty sure it will be the global lower class that will be eliminated. That is, most of the entire populations of Africa, Latin America, and Asia, plus the lower class people in America, Canada, Europe, and down under.
Overpopulation imo is elitism of a horrific severity, even worse than the Nazis, that is packaged as ecological awareness and humanitarianism.