Singling just the RP "trends" seems sort of foolish when all the other ones will continue to exist and likely multiply. As stated above, creating more communities for RP secrets could lead to creating more for other groups, and that seems pretty ridiculous when fandomsecrets is already an offshoot. RP is as much a part of fandom as cosplay, fanfiction, fan art, and so on. People will always have something to say about one of the above that will echo a sentiment shared by many, so really what you seem to be after is getting rid of trend secrets rather than RP secrets, which is... well, impossible.