Hello Blizzard! And Alliance!
Its your favorite Abomination from Stormwind here.
I have an idea from Ascension WoW in mind to enhance world PvP in WoW: making kind of like world battle system in-game. Meaning as raids, or guilds we could fight against other guilds in our cities within a system that gives us points. Modes would be Attack, or Defend like in Overwatch. The system could be similar to Battlegrounds, but we fight in our beloved cities not just Stormwind, or Orgrimmar.
Some guild wants to fight The Scarlet Scourge and attack Orgrimmar in a mode, where we defend the city. Likewise we get to attack Stormwind as well and some guild / raid accepts to defend their city. This kind of mode could generate several options of new tactics to the game and make communities stronger. Sadly stronger also the hate towards enemy factions 
It could happen real-time in the cities other people seeing the fights as well (just an idea), or in kind of like Battlegrounds hidden from other people.
The only problem I am seeing is the realms currently in-game. It should not be like we defend our city in Orgrimmar on a 0,1% Horde based realm lol. This is why The Scarlet Scourge is in Ravencrest after all to make, or at least try making world PvP active again.
This new World Battle system could earn players special rewards like new world PvP gear, new mounts, toys etc. in order to make players interested to world PvP more. Just like Rated Battlegrounds give you points to buy something cool as a reward. Somehow special loot that can be only be available in world PVP mode.
Maybe somehow phased system? I dont honestly know how it could work. World PvP has been fun in WoW for years, but sadly in Retail WoW it has been kinda dead lately. One of the reasons zones being phased for example. I would love to see it back.
There could even be Championship based system, where it could have a table of the best world PvP guilds or groups. Some kind of Seasonal system for that to the best players. Bringing back the fun and fairness into world PvP
For example Siege of Orgrimmar should not have happened like the way it happened. It should happen in the communities between the players!
Only problem I’m asking myself, if there are any demand for this kind of world PvP system these days?
Sincerely yours,
Abomination