This is one of the reasons I really think simulacrum games need to be published with the aim of attracting new players, not just being a set of rules publishers can use to publish material for older editions of D&D under the legal cover of the OGL. Most of the people playing older editions now probably don't need enough new professionally published material to make publishing such material a truly profitable activity.
There is the belief that "no new products" = "dead game" = difficulty in getting new people to play it. So then, "new products" = "living system" = grow the player base... just by virtue of new products existing.
I don't think it's that easy... but it certainly doesn't hurt.
