I'd wager that the primary reason we've not yet seen another Empire of the Petal Throne (though I think we've seen plenty of Blackmoors) is that there's not much interest in such a thing. If the history of the hobby has taught us anything, it's that "vanilla fantasy" will always be a bigger draw than something more outré. Tékumel, which I love dearly and consider one of the finest works of 20th century fantasy in any medium, has had a lot of kicks at the can, going all the way back to 1975. If there were a huge, pent-up demand among gamers for something like it, I suspect Tékumel would have been more widely known and used for RPGs. Ditto for Jorune, Talislanta, and many, many other very fine games that are probably more talked about than actually played.
Lest I be misunderstood -- goodness knows that's never happened before -- I'm not denigrating the notion of something other than vanilla fantasy or the desire to see "new" old school RPGs. My point is simply that gamers like what they like and, if we haven't seen enough "originality" (by whatever measure), it's because most gamers don't actually like that kind of thing. Again, let me be clear: I'm not suggesting that gamers aren't imaginative or interested in ideas that break the mold, but what experience has shown me is that, when forced to choose between a game/setting that's closer to what they're familiar with and one that's not, they'll choose the former by a large margin in most cases. Those who prefer the exotic will always be a minority and, more to the point, there's no way to predict what game will finally be the one that makes a breakthrough.
This brings me to the second complaint, namely that the old school renaissance is "too D&D-centric." Quick quiz: what's the most popular tabletop RPG in 2011? How about 2001? 1991? 1981? The answer now, as it has been since 1974, is "Dungeons & Dragons" (or some variation thereof, if the claims that Pathfinder is in a dead-heat with D&D IV are at all true). Consequently, it shouldn't surprise anyone that the OSR is dominated by D&D. I've noted before that, when I post about games other than D&D, there are significantly fewer comments. Why? Because now, as in the past, D&D remains the 800-lb. gorilla of gaming, especially so when you're talking about old school gaming.
I'm personally very interested in a lot of other old school RPGs, which is why I'll continue to post about Space Opera and Stormbringer and Bushido when I have some thoughts to share on them. But I recognize the fact that most gamers, even most old school gamers, aren't as interested in these games, many of which are, for all intents and purposes dead and buried. I mean, is there an online community devoted to, say, Universe that I've never heard about? Are there bastions of Superhero 2044 fans hidden away somewhere? It's not like there's a conspiracy on the part of the OSR to exclude these other old school games (or the gamers who love them) from our discussions. It's simply that, from my perspective anyway, there's no interest in them whatsoever, beyond a handful of guys who like to use them to bash the old school renaissance with a convenient club.
Ultimately, as Rob Conley has said again and again, the old school renaissance belongs to those who do. Thanks to the OGL, cheap and easy-to-use layout programs, and print-on-demand, anyone can do what Gary and Dave did back in 1974. We're all empowered to follow our passions and create the games and game material that we want. So, if anyone's frustrated that no one's created another Tékumel or there's no retro-clone of Bunnies & Burrows, that's not the fault of the old school renaissance. By the same token, just because there is an old school renaissance doesn't mean that anything that calls itself "old school" will be embraced enthusiastically. Now, as then, gamers will like what they like. I'm sure Dave Nalle wishes that Ysgarth really took off and became a popular fantasy RPG, but it didn't, because it just didn't catch gamers' fancies back in 1979. That's always been the way of things.
It's now easier than ever to produce and distribute tabletop RPGs and RPG materials, but someone has to create them. Since the old school renaissance is a hobbyist movement made up of individuals rather than a hive mind, it only stands to reason that we get what we get based on the interests of those individuals who're putting forward their creations and sharing them with others. Don't like what's on offer? It's trivial to be able to put one's own stuff out there and that's one of the guiding principles of this crazy little thing we've got going.
With that in mind, and in accordance with the Joeskythedungeonbrawler Protocol, I offer the following from my Dwimmermount campaign. The text in the quote box below is hereby designated Open Game Content via the Open Game License.
Fetish of the Rat King: This small wooden carving of a rat that functions much like a ring of animal control on rodents, but with some differences. First, the number of rodents that can be controlled at any one time is 10-60. Rodents that are inherently magical or possess magical abilities are immune to this item's effects, which last as long as the user concentrates. The user can also speak with and understand the speech of all rodents while possessing the fetish. There is a cumulative 1% chance per use of the fetish to command rodents that the user will be cursed with lycanthropy and become a wererat.