Is population collapse really a bad thing?

I'm sitting bumper to bumper in a big city in south America now to go roughly 5 miles. I think I could have walked quicker. If population dropped to 1900s or even 1800s levels as many experts say it will (and I agree)... Is that the worst thing?

Assuming this happens from people not having sex, not a mass plague or war.

Is population collapse really a bad thing?
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