I think we're all social creatures and if we isolate ourselves for a long time, most of us will feel the weight of it and we would not be happy by ourselves. That's why live in big communities or cities. If you listen or watch countless lectures, it is scientifically proven that we do need to socialize to keep functioning normally. Of course, there are exceptions here and there.
It also depends where you were born. People from small towns or villages usually run away to big cities to feel the hype and what they we're missing for most of their childhood lives, while the city kids tend to move out to the suburbs.
For me personally, I like to have it 50-50. I love the countless options of the bigger cities, but on the other hand it's also nice to retreat to quiet place and relax once in a while.
Cities will grow even larger in the future, unless something or someone knocks us back to the stone-age.