I think you all are dead on about Namco and its lack of promotion. Enslaved and Maijin are both solid games that got little or no promotion. Both had demos that helped convince me to buy them, but even the demos got little or no promotion.
I'm not sure pre-released games will solve the problem, but it defintely can't hurt. I think Dead Rising Case Zero is a good start. Have a prequel that ties right in to the final game and gives you some sort of bonus.