Odd site. I'll read some if I get a chance.
First on the undesirables in cities. A lot of these people do not choose this life. One major problem with life right now is so many people are one or two paychecks away from living on the street. And once you are there, that is where you will stay. This is more or less due to not enough jobs out there, and who would give these people a job. But also there are the "leaches", people who have nothing better to do than just take what the world will give them and give nothing to help back. And in a city like described above, these people will thrive. And will bring the downfall of it.
Second: A city like above will have to be a segregated city with a population limit. You can only allow the people who would most help it (and maybe only for a set time). And then you can only have a set number of people in it until you began to have people who have nothing to do, or over populate a set job type. So you need to get rid of them. Or maybe a Logan's Run fix by killing everyone once they reach a set age.
Also I am thinking more of the area of the silent movie "Metropolis".
Quote:
Metropolis is set in the year 2026, in the extraordinary Art Deco skyscrapers of a corporate city-state, the metropolis of the title. Society has been divided into two rigid groups: one of planners or thinkers, who live high above the earth in luxury, and another of workers who live underground toiling to sustain the lives of the privileged. The city is run by Johann 'Joh' Fredersen
The main city is paradise, with amazing technology. But it is all due to the slave like use of the workers. And shows someone needs to do the "dirty jobs" that need to be done.
Now that can be fixed by robot workers or the like. But then you fall under the largest problem with technology, at some point all technology will fail. Some are minor problems and others are major disasters. But even a minor problem can plunge the city into chaos.
Wow I have a sad lookout of life, no wonder I am so grim at times.