.The cities will empty of working, legal, ambitious, family-oriented people, to be replaced by gangs of feral humans, preying on each other & anyone else unfortunate enough to come across them. Policing will be done by a private military-styled force, pay-as-you-go service.
The average person will not be able to afford any policing & the only weaponry available to defend yourself will be illegal. Shops will close, all of them, all remaining services will be 1st floor upwards, with ultra-heavy security on the ground floor.
Shopping will be done online & at vast, out-of-town, covered shopping markets, that will have massive security & will be prohibitively expensive. Anyone with any sense will have left large urban sprawls, for secure countryside estates, again, with private security, paid for collectively, by the residents of the estates. The poorest people will be annihilated, in the new age that is upon us.