Retards in the 1960s believed such. But the reality is that it's not even needed a little. And subreplacement fertility isn't "population reduces for a bit, then stabilizes"... subreplacement fertility is actually "the population continues to shrink, accelerating and shrinking faster until extinction inevitably ensues".
So you're not really a "I want a lower population", you're part of a death cult that wants humans gone. Forever.
>this is good for pretty much everybody.
It hasn't been good for anyone, except some tiny minority that is measured as much less than 1%.
>There's absolutely no way we can keep extracting resources and polluting at the rate demanded by our current enormous population (which has more than doubled in my life time).
Already shrinking. Visibly, indisputably shrinking. And the western world isn't doing the polluting.
>Unfortunately, your theory isn't working, as the population still grows.
No, it already stopped growing. Ran out of gas, but as the car coasts to a stop you can delusionally pretend that the engine's still on, and that we aren't coasting up the hill. If somehow I were wrong, it wouldn't be unfortunate at all, it'd be a wondrous miracle.