I like Persona and – about a year ago – was thinking of using the service in a medium sized project I'm managing. I did some experiments and it (technically) wo

I like Persona and – about a year ago – was thinking of using the service in a medium sized project I'm managing. I did some experiments and it (technically) worked fine for our purposes, and educating users on its use didn't seem too hard either. In the end though, I decided to roll our own (simple) authentication system because of a lack of hard guarantees that Persona (the service) would still exist a few years down the line. I don't like to depend on external factors for long term projects that go into maintenance mode and this is very much a problem with 3rd party authentication. We could of course try to install the Persona server ourselves, but that seemed like a bit too much effort considering the size of the project. In short, Persona good, uncertainty around it bad. I guess it suffers from a chicken-and-egg (or critical mass) problem.