That's right. That's exactly what happened. Most competitive players have left; leaving the casual and easygoing "players" who're here mostly for the social.
Comp discussions dropped, OSL/serebii frontier were torn, numbers of clans have shrunk drastically due to no appealing factors for newbies, decent players and contributors left cuz they realized how this place wont get them places nor any recognition they deserved, numbers of tournaments have depleted, comp moderators have nothing to do but locking threads and wait for miracles to happen, and the RMT now is mostly filled with garbage.
Basically this section is just waiting for its demise and I bet you notices drastic changes, since 2011 & 2012 were the prime years of comp scene in Serebii (imo)