I don't understand why no one has tried doing any of the normal methods of pushing something
Say, getting tons of people to write letters to GW daily asking about BFG. Calling them often about the game system, signing a roster of people who play BFG and new people who would if it were more supported.
Even utilizing things to invoke interest, much like that guy was doing with chronicles (although I think that is a bit too weird and off-set) By forming a group of BFG interested, and hosting national unnofficial events such as 'paint a ship day' or even a worldwide campaign. Naturally it would have to be heavily advertised on any GW associated forums, sites etc. and likely you would have to link it with 40k as much as possible to boost interest.
Similar to how someone is doing at my lgs, he put a few BFG games in with a 40k campaign to push people to start playing.