Sorry to go back to the stuff that was discussed at the beginning of this thread, but, in answer to those who say that the Excalibur crew going rogue would be a retread of B5 going rogue, it occurs to me that we would likely have seen this from a far different perspective. In fact, I think Excalibur going rogue might have been a lot more interesting.
In the case of B5, the *buildup* to the breakaway was incredibly interesting. But after "Severed Dreams", the focus of the show shifted back to the Shadows, and the consequences of B5 being independent didn't really take center stage until "Epiphanies". At which point, we had about a half season that dealt with B5's political dissociation from Earth, with much of that time spent on Sheridan leading a revolution to topple Clark.
One never really got the sense that the B5 crew was *alone*. They were on good terms with a great number of alien governments, and there were also quite a few other dissidents from Earth, including the governments of several of the colonies.
In the case of Crusade, however, you could have the Excalibur completely on its own, hunted down as criminals, no sanctuary anywhere...with the crew thinking the whole time that they'd never see their friends and family again. (Sure, folks like Lochley on B5 would help them out, but all of that would happen in the shadows.) It would be a very different dynamic from what we saw in B5.