From looking at various tumblrs posts on the subject, most genuine creators are shifting to combinations of: twitter, patreon, snapchat and instagram. If you wanted to meet and talk with kinky people there's a ton of active sites and communities anyway which are going fine: fetlife, getdare, collarspace, xhamster, pornhub.
Temp.exposed will shut down, the site owners really don't seem willing or able to sort out the problems and the site has always been built and run in a rather amateur fashion. A new one will open up i'm certain, temp.exp was like the 3rd or 4th copy of something else (like destroyable.io as well), because it's an easy format to create and run for a short while. And there's an idea there which can be run very professionally and legally with some effort and investment.
KinkTalk could benefit and re-design itself as a tumblr fill in? Probably not as it would be a big job but that would definitely improve the site