Shemeska
Adventurer
BOZ said:Andy, (if you're still following)
this question doesn't involve Planescape (my above comments should clearly illustrate why), but rather most of the other ex-settings. instead of attempting to revive product lines, have you considered going more of the Ghostwalk-type route? you know, release a single all-inclusive package book that details a particular campaign setting and what differentiates it from the norm. this would give DMs and players enough to start building on, and if they wanted more stuff they could seek out older edition product. this reintroduces the material without a large commitment from the publisher. if the demand proved to be great enough, you could consider providing additional material. Ravenloft (AFAIK) is still licensed out, but you could publish such a book for Spelljammer, Mystara, etc this way.
That would be a very sweet idea were it to come to pass. A Planescape book like that couldn't do worse than Ghostwalk itself did.