I don't think the sharing economy as a whole will go away.
Homejoy is a bit special in that they sell something that you really only need once, and that's if you know nobody who will recommend you a cleaner. (Why don't they pivot, for instance into a moving company? Pays good money for college kids if they happen to be free, cheap for people who need to move. Location services lets you identify people who are near the opportunity.)
But the idea of a service where both buyers and sellers can find each other on a casual basis is sound. It's just that we need to sort out what the terms are. Should full-time Uber drivers get different protections from part-timers? Needs a trip through the social/political grinder for an answer.