Actually, JMS rushed through writing Legend of The Rangers, and it did have lots of potential - Lots of faults to be "fixed", though. The original B5 pilot wasn't anything amazing, either. And lets not forget that Crusade was shaping up to be a fine show, the popular demand for the DVDs showing that. I too am cautious that TMOS is going to be another "action adventure" type B5 movie ... Thirdspace anyone? But, ITS picking up several plot elements from the dropped Crusade series (I have three of the scripts from the unaired episodes, and all I can say is - Wow, getting good.)
Still, no matter how brilliant the movie is, or no matter how many hardcore fans out there are going to be spreading the love that IS B5, I just *dont* think it can really hit it big on the big screen. Not for any faults of its own, but just the general public is blinded by TV trash these days.