Futurists don't consider overpopulation one of the issues of the future. They consider it the issue of the future.
One thing the futurists never get right, though, is that the extreme desire for polyester only lasted a brief period in the '70s!
This is actually a very important principle that science is learning about large systems like evolution and that futurists are learning about anticipating human society: just because a future scenario is plausible doesn't mean we can get there from here.
There are lots of futurists that spend their whole life trying to figure out who we're going to be in 40, 50, 60, 100 years. That's the great thing about science fiction.
The Futurists?. . . . Well, of course, they are already past.
Many futurists use a checklist approach to make sure they're covering a sufficiently wide set of topics in terms of both research and brainstorming during a foresight exercise.
I never quite trust futurists because I think they're kind of telling us what they think our future should be.