The working girls have most likely gone on-line. Why stand out in the street, when you can garner customers from the comfort of your La-Z-Boy sipping a pina colada?
I doubt they’ve gone away.....they’ve just changed their marketing/procurement strategies.
There was a big scandal here a few years ago when an escort service was busted and a federal judge showed up on the john list. One of the local TV stations discovered there is a website that connects hookers and johns locally. Wouldn't be surprised if that kind of thing is in lots of cities.