They could have run it again. 500+ is easily enough to be self sustaining. It sounds like they just didn't want to do it anymore. There's a lot of missteps a convention can overcome and keep going, but if the core staff simply don't want to do it, it's going to go away. It won't surprise me if this happens with some other conventions. People may discover that they have other interests they'd rather put time into. Particularly with ones that will end up having to miss two years.
They could have run it again. 500+ is easily enough to be self sustaining. It sounds like they just didn't want to do it anymore. There's a lot of missteps a convention can overcome and keep going, but if the core staff simply don't want to do it, it's going to go away. It won't surprise me if this happens with some other conventions. People may discover that they have other interests they'd rather put time into. Particularly with ones that will end up having to miss two years.