I made the point in another thread that all of the stores that are fleeing these areas because of the rampant crime are creating shopping waste lands.
In a few years we're going to start hearing about how these heartless, racist corporations are making it impossible for the poor inner city people (yeah, as if there are actually poor people in San Francisco) to survive and aren't they horrible.
So, the stores start getting government incentives to move back in, which creates a cycle of recovery in growth, and once again the racist corporations are at fault, this time for making it impossible for the poor folk to afford their gentrifying areas.
That cycle happened after the crime and violence of the late 1960s and early 1970s. It happened to a degree, again, in Washington, DC, along the Georgia Avenue Corridor after the Cinco de Mayo riots in 1992.