Holy crap, guys! Get this in stores! Talk with Volition to see if you can even bundle FS2 and the Turey's installer into the DVD! THAT WOULD BE SO COOL! I would buy a copy for novelty sake!
Why in Yog-Sothoth's starboard side testicle would that be cool. Even if it were possible (which it isn't for two major copyright reasons and one commercial), it wouldn't be cool.
Why is it impossible? Well starting from legal issues, TBP uses FS2_Open to power it and bring it to life. That in a nutshell means it's a game that uses an open source engine and in a truncated form that means it can't be used for commercial purposes. Not to mention that Volition owns the original source code, which is still in the core of the engine, despite all the open source additions to it. I don't know exactly what licence FS2_Open is under (LGPL? Something else?) but rest assured that commercial exploitation would be pretty much against law and the spirit of the community around FS2_Open.
Second legal issue is that even though the intellectual property used to create The Babylon Project belongs to respective owners of Babylon 5 trademark (JMS, Warner Bros., possibly some others), the content of the game is still made by individuals (modeling, texturing, stories, mission design...) who have the copyright to their work, and anyone who wants to involve money into things like this must have an agreement with the creators - every single one - about compensation terms and whatnot... which I can't really see happening to be honest.
Commercially, it would most likely be a nightmare. Distribution of physical media would require entering a publisher in the mix, which would further complicate things. Most likely no one would want to publish the DVD either, and few people would be willing to buy it seeing how they can get it from the net as well. Even if physical media, if correctly packaged and marketed, could attract some members of the community, it would be unlikely to gather wide enough interest to be commercially viable.
Not to mention that a game that you can get free legally is a lot cooler than having to pay for same game...
Same points largely apply to Turey's installer, with the exception that vanilla FS2 is actually being re-distributed commercially in small scale already.