To get a community vibe back, could take as little as one proactive Horde starting a WPvP guild. There are players out there that want this, maybe they are not on the forum though. Find em!
Step 1, someone form a Horde WPvP guild.
Step 2, engage in prearranged guild v guild WPvP activities suitable for smaller numbers.
Step 3, recruit via guild trash talk on forums, build community around guilds.
Step 4, when enough guilds and player numbers, engage in guild v guild wars.