Obviously, the net is changing. Or I am. Some time ago, I'd have just picked up a name from the roster and taken off, no matter what good the storyline would be. But now I look at my internal "time available" and "fun achievable" gauges and note that both register very little when presented with your project.
It's a nice idea and a nice format (who remembers the awkwardsness of Play-by-Mail?), but the content is nothing new, and nothing exhilarating. If you have some idea which would make the whole thing a bit more thrilling (whatever - how about: The Saratoga has a leak, there's only 24h of oxygen left? Nah..), I'd be sure people will look in.