Honestly, I think a lot of us have just grown out of fangaming, at least those of us who actually produced games reliably and regularly instead of just walking demos. There's no real solution to that. Life goes on.
Pretty much this. Along with this, a lot of people are growing out of fan gaming in general. More people are focusing on indie games now overall. Some places like Pokecommunity still seem alive and well (it's always been very well populated anyway),
but not like it used to be. (nevermind that, it still seems to be more active than ever)
If there were a very decent fan game out there, I'd be more than interested, but (no offense to anyone), I just haven't seen anything that interesting, or anything that hasn't been done to death already. Shadowgazer looked amazing, but he turned to indie development instead, which further pushes my first point.
I don't think ZFGC will get much more attention even with advertising, and if it does, because of some big project, it'll be a bunch of kids coming and saying "WHEN WILL THIS GAME BE OUT?" "DOES IT COME OUT ON DS?" "IS IT BEING MADE BY NINTENDO?" "WILL NINTENDO PICK THIS UP?".
As for a community project, it won't work, and probably at this point, never will work. For reasons listed above mostly. It's already been attempted as well, and didn't turn out well.