So, what are you afraid (and I use that word since you appear to be trembling in your boots) that will be done? Shut down the police force? Won't happen. Defund the police force ? Won't happen. Outlaw capitalism? Give me a break. Legalize abortion? Already done. Defund the military? Not in his scope of authority. Increase welfare? Again, not in his scope of authority. Outlaw personal firearms? The courts have already ruled that a city cannot implement greater restrictions than the state has.
What will happen is that the new office holders will be committed to moving the City ahead economically while paying lip service to their uber-liberal political positions by virtue signaling on matters on which they have no control.
Please, change your drawers, take a breath, and move on. The City will be just fine with or without you. You really have nothing to fear unless Pureval and other members of his political perspective continue to control congress. If they do, there is nowhere in the US to which you can move to avoid its impact.