I stumbled onto this article the other day. "Shoulda Been Bigger: How Star Wars Killed Babylon 5." It posits that science fiction fans were so wrapped up in the Star Wars prequels that they had no attention left to spend on science fiction television like Babylon 5. And that in a world with no Star Wars prequels, presumably, Babylon 5 would have launched into a hugely successful franchise.
I call bullshit.