They could even promote the dense urban clusters as "utopia" at first, attracting most of the populace. Once they are in, the conditions of the city would slowly deteriorate; but a population that was born in the city and never moved beyond a few blocks would just not know that there is anything better.
[0] http://www.chinadaily.com.cn/a/201801/04/WS5a4d8db6a31008cf1...
The current regime seems to be acutely aware of this and has been actively spreading Chinese influence (and finances) over the rest of the world.
There's a lot of mismanagement and climactic shifts in the pre-modern period. Often those are tied together, with failures of the hydrological infrastructure. But another common thread is high imbalances in male/female populations, leading to lots of disaffected young men, and millenarian religious movements.
With really good and fast transit I don't see a reason why we have to live physically near where we work though.