I stopped at my FLGS today, and asked why there wasn't much in the way of rpgs on the shelves, anymore. The employee there said they pretty much just sell D&D style products and there's really not much demand for anything else. So I asked him about D&D number 4. He heard that it was designed more for convention play, as they found that people at conventions like to go from table to table and play their miniatures--without having to do too much role playing. But he admitted that it was hearsay, and he hadn't actually looked at the rules yet. However, he heard that people who are into D&D (and got to play some of it) LOVE the mechanics of the new edition.
This is a bit off topic, but i realized just how much the artwork of an rpg can make people really want to buy it. There was a bunch of books for "Castles & Crusades" and the artwork was really good. I almost bought a supplement for it because of the maps and the art. The employee at the store said he heard the gameplay of Castles & Crusades was ok, but when it comes to fantasy role playing, D&D is pretty much the only game that people really flock to.
Basically, BRP will probably never be seen on the shelves of my FLGS, because more and more people are going for miniatures games;-(