swordchucks:
I think you can go a step beyond that and say that RPOL, by its very nature, attracts people that are otherwise fairly busy or reclusive. The long-term format of games is also a major weakness for games dying, by its very nature.
Sadly this is the very reason why I joined RPOL
I attempted to get a "Standard" PnP game running but never had time to do more than a session every 40 or so days, Not conductive to actually running a long term game. One of the players accepted a job that would take him out of the country for an extended period of time. That person happened to be part of RPOL and told me about it. I moved the game online and was able to at least get more than a few sessions in before RL took over and the game folded anyway.
Now my second attempt however is going strong as I learned from my mistakes. I'm currently working on a third, however since the concept is from scratch and not one I've been working on for years i'm not comfortable getting it off the ground yet.