I think you've hit the nail on the head.languagegeek said:Stuff
Older folks like me (late 40's) are probably more inclined to be drawn to the 'pulp' fiction style settings, Eternal Champion and Conan (not my personal cup of tea). When I first started reading fantasy, Moorcock was one of the first authors I picked up. This was back in the late 70's and their wasn't anywhere near the diversity in fantastic fiction as there is today. I can't count how many fantasy novels are sitting on my shelf at the moment, a couple of hundred at least and the majority of them would make fine RPG settings. However, that doesn't mean they should be made into settings. Fantasy fiction is becoming more popular, I don't know if the same is true for Hobby Gaming in particular tabletop RPG's.
I reiterate my earlier point, Mongoose should support and develop the Legend lines and settings it currently has, making the world of WR the default Legend setting, and leave additional settings to 3rd party authors. D&D, whilst it has had several settings, still focused primarily on 3 settings supporting them to the hilt. That model works for one of the biggest publishers in the industry, it should work for Mongoose as well.