The problem is, the middle class is fleeing the cities and taking the tax base with them. The illegals coming into the cities are peasants without any skills or education. Taxes are skyrocketing due to the need for more social programs. In order for the schools to maintain their funding from the state, more taxes are needed.
To add more problems to the fire, when the middle class departs, wages will be reduced since immigrants work for peanuts. This is the start of the downwards spiral to a depression in metropolitan cities because housing and rent will go down since the qualified buyers disappears.
Interestingly, what with the Internet and all (thank you, Al Gore), we don't really need to amass in cities anymore, not like we did during the heyday of the industrial revolution.
This may be nature's way of thinning out the cities and equalizing population distribution. There is so much unused yet usable land in this country. I can handle living in a huge home on hundreds of acres while earning my living via online and telephoning communications. I'd be happy with that.
OK, I'll digress from digressing now.