Population will likely continue to grow, for quite some time, and resource management and technology will have to follow suit. Moreover, suburban sprawl is unsustainable. We're going to have to see the rise of mega cities eventually. I argue that one of the only reasons why we're so spread out is because the government uses revenue from cities to subsidize sprawl. Think of how expensive roads and other infrastructure are.
Then again, I'm still not convinced we're not going to see a massive natural disaster that'll end up wiping out most of humanity.
Disputable. We have formed city states dating back to Neolithic and then started towards that since Sumer. Urban development primarily depends on resources, technology and economics. I'm fairly confident that in around 20-30 years' time conditions(infrastructure, health system, commerce and especially technological advancement) will improve worldwide (or at least regarding European and American standards, since a new, superior settlement in most of Africa would still remain primitive at best), but that only if there's a harmony between the mechanics of the way things are supposed to work out. And in this case, we as species might or might not progress in this regard as well. It all depends on the set priorities, really.
P.S: Regarding shrinking numbers, that also involves politics.
Thanks Daniel Goldman , the population growth in the world will continue until the middle of the century, then begin to decline, but the biggest problem is to increase the population of cities
Ihsan Jasim, the environment can handle it, so long as we do things correctly. Switching to nuclear power and doing things more efficiently will help. But one super volcano erupting would destroy us anyway, so I have to reiterate the importance of getting off this planet, then we can build colonies elsewhere.