I'm still playing Saga, and I'm currently doing a Starcraft mod for one of my live groups. For me, the Saga rules system will always be the one (with some additions from others as I go along).
With Shadows, I think life just got to busy for khan. It happens.
If I wasn't GMing two live games already, plus playing in a third, I'd GM a PbP and put out feelers for players, but changes in my work schedule are leaving me with less hours to plan my other games, and I wouldn't want to make a subpar plot for my players in a PbP.
I'd probably join another PbP if one started (I was hoping bobshadow or one of the others interested in PbP would have started one, because of the permission I gave, but I'm not sure if they've been on since then).