This discussion is making me feel that a separate ER subboard is the best idea, as it avoids the issue of making sweeping decisions made by ER players (some of which don't even play other games that much) about how we should categorize other people's games simply because we really need to categorize ER (as I honestly can't see how the other games bother anyone, given how RotMG, the only game of a comparable size I can currently think of, doesn't look like it might grow beyond two or three threads - there's an IC and an OOC thread, and maybe some kind of IC OOC thread, I think?).
There's two questions about an ER subboard - the more important is favoritism, and to this I answer not that piecewise is great enough to deserve honorary godhood or any hyperbole like that (even though piecewise, as is popularly known, is great indeed), but that no other game on the RTD board actually has grown to such a point where you'd attain any measurable benefit from separating it from the rest. By getting separated (and thus allowing for more thread creation, general organization and other nice things) ER would presumably improve in readability and playability, which you can't really say about, for instance, Deviation-22, the Warrens of Oric the Awesome, or any other single-thread long runner, and possibly no twin-thread game either. It's not a matter of giving piecewise accolades and such, it's an issue of making it so that people can play ER more efficiently and with fewer problems in comprehension. If it hasn't become too unwieldy to effectively play already, it likely will in the near future as the thread count and player count continues to increase. And if somebody else can make a game as immense and player-rich as ER, no matter the merits of the game itself or the GM that makes it, it should get its own subboard as well. PS: if you let other games share the subboard with ER and let piecewise go nuts with thread creation, it would cause the problem of ER cluttering up that subboard, while if you prevented piecewise going nuts with thread creation, you would rather limit the ability of ER to fragment into more easily-digestible chunks.
The second issue that was raised was 'what if piecewise can't update anymore?' In that case, I do believe Toady can move the threads back to the RTD board and dissolve the ER board. It stands to reason that if you can create subboards, you can delete them as well, right?
Anyway, those are my thoughts. I have clarified them to both myself and others in this manner. Inform me if I am not being sensible.
EDIT: Ah, yes - piecewise, one of the neutral votes in the poll is mine. If it turns out to be important, consider it to be in favor of an ER subboard.
EDIT 2: Also, if your reasoning for separating long runners (lasted a long time), wide runners (have lots of posts) and deep runners (have lots of players) into a separate subboard is to give them recognition, that is what the RTD Library and Hall of Fame and maybe the Forum Games List are for. And if you are worried about the seeming nonfunctionality of both, maybe you should consider helping out the people who are tasked with running them. Probably not the most practical or desirable suggestion, I admit, but one that could possibly work.