Crusade interested me the most out side of my current campaign arc (I'm taking the kids though the 'Fiery Trial' as an A arc and another plot line involving early work by the shadows destroying a Minbari listening post near Za'ha'dhum, and a Dilgar scientist bent on silencing all of space around there to non Shadow comms traffic as a B plot. Initially involving our warrior woman Minbari but quickly engulfing everyone else.
My worry is that the B plot might overwhelm the A plot because it is more immediate to them the the IPX dispensed make work. Balance...balance.