I'm seriously considering it actually, but not 100% sure at the moment... :)
And yes, it would be awesome for fandom, but the whole point of the service is to be able to have all kinds of data in it, so... :)
Check, for example, Wikia, which contains Wikipedia for TV Shows which are more complete than Wikipedia.
If you're worried about competition, release under AGPL.
Similarly for the data, to the extent restricted by copyright and such, release under CC0 (same as Wikidata). Or if you want to be onerous, ODbL.
Some neat ideas in the project in any case, good luck!