On the other hand, given the hits to population (hello VITAS! hello VITAS again!) and increased threats due to smaller countries and various wars, it wouldn't surprise me if a lot of people fled the wilds and they are, well, more wild now.
Yeah I haven't studied in depth, but I believe total population numbers are lower in the 6th world but the sprawls are much more populated. Which leaves a VASTLY smaller rural population, even before environmental policies (or lack thereof).
World population by our numbers today is estimated to reach 10 billion in 2080.
The numbers mentioned in older books for both global waves of VITAS (2010 and 2022) are 1.7 billion and 500 million deaths (combined about 33% of the population at that time), which actually only sets the population back about 30 years (6.9 billion in 2010, 4.5 billion in 1980)...
Which still leaves us with estimated 9.3 billion people in 2080 (the number that should be reached in 2050, without VITAS) or more than 2 billion more than today.
And that's ignoring for example the faster life cycle of orks (and the fact that same orks are poorer on average with poorer parts of the population statistically having more kids anyway....)
So... even when we include VITAS it's really not realistic to assume a lower global population by 2080.