To be fair, overpopulation was never an actual concern. Since the 1800s, food production growth rates have outpaced population growth rates. Underpopulation _is_ a concern when infrastructure and social structures may not be able contract quickly enough to sustain our current quality of life.

Don't worry, overpopulation will come back as a concern when we get massive crop collapse due to climate change.

The food scarcity concern was certainly overblown, I was thinking more about the environmental concern.