I guess the only way the site is going anywhere/Same type of site, would be if someone was willing to spearhead the thing. Once you have real intitiative and start the project going, I'm sure you could post here for help setting it up with a specific issue.
I for one, don't think I have the time to spearhead it, But I would be more than happy to work on one small aspect of a new site. (I.e. make some challenges, test things out, make a mybb forums etc.), and I am fairly certain others are of this same attitude.
The reason I left for a couple months really came down to two things: Not many people, and no new content.
Although it would be preferable to have adum revive and rejuvenate the website, if someone was willing to be in charge of making the new site, I am sure that can find plenty of help, and ability to delegate tasks to people here.