[GratefulCitizen]

These nutty leftists can cause destruction, but they lack the ability to transition and consolidate any gained power because of the nature of the existing economy.
Specifically, transportation and insurance.

They always go after densely populated areas because of friendly/weak local leaders and the anonymity of crowds.
The handful of adventures into less densely populated areas have been severe failures (but have made for some entertaining videos).

Densely populated areas are completely dependent on surrounding areas for everything which, in turn, requires transportation.
When these areas become unsafe, transportation of goods diminishes.

There are already trucking companies who are planning to cease service anywhere that the police are subject to defunding.
They don't want to risk drivers/equipment/cargo and don't want to pay all the elevated insurance costs which go with servicing such areas.

Existing businesses in the area of all sorts will cease to operate because insurance will be too expensive or denied altogether and profit margins will further suffer from tightening supply/increased costs due to shipping issues.
The same insurance/logistical problems apply to any attempted functioning of local governments.

Like it or not, insurance and shipping companies decide how (and whether) economies function.