What we're talking about: arstechnica.com
I wouldn't worry a lot about the 'whorepocalypse' due to FOSTA. At least not yet.
This will certainly affect sites with a traceable US presence (Craigslist, Backpage, etc.). It may also start to affect US-affiliated niche sites catering to the adult market (Eros, TER, SA, TUSCL, etc.) despite measures they take to protect themselves.
Should these sites shut down, then I expect many of the services they offer to pop up again on sites operating on foreign servers and under foreign ownership. FOSTA can't touch a site based out of Singapore.
It would be more alarming if the US government pressures big ISPs to limit or restrict web traffic to those sites using FOSTA as leverage. This is possible now that the net neutrality laws have been gutted. But we're not there yet.
I strongly believe that there will be a First Amendment challenge of some sort.


Also, I predict that at about 3pm EST, SJG will start begging us to join his "lifeboat" forum in case TUSCL blinks out of existence.
What a twat.