The Serosi plot is pretty much dead. I just left, and I'm pretty sure you and Crymson are on your way out of it too.
I would stay in it longer, had there been more things to do rather than killing thugs all day. Don't get me wrong, I thought the Serosi plot was engaging, more than the main plot which I don't think I involved myself in entirely. Sad to see it go.
No one said he couldn't. Everyone just kindly pointed out that, though it was a good idea, basically all the other sub plots were dying/stalled anyways, so his own sub plot wouldn't likely get far itself. No one has denied him from starting it really.
So the hopes of a new sublot is a bad idea due to fear of it lasting a short period of time? I would have to agree somewhat with you, but sublots are fun to do because it seperates from the overall main arc of the RP.