Could be possible with B/W, prizes, and maybe some other stuff. ;(
By the way, you could maybe revive clans during B/W release but with stricter rules lol. At least it was active when clans were around.
Want to close the league? Doesn't look like anyone will be challenging soon lol. I am reviving/revamping it when BW is released in USA to make it more interesting. If that fails, leagues just won't work in PC.