WPVP as we knew it is dead. at the most you will find a 5 v 5 fight for maybe 1-3 mins before the horde overpower the alliance and it becomes a 15 v 5. Here are the problems with WPVP:
-Not Enough Alliance have WM on.
-ZERO real incentives to turn WM on.
-No more rivalries as most people you see in WM will be off realm
Sadly WM and sharding will never go away but if blizz actually cared to help wpvp they would re-introduce real incentives to do it, I am talking Korthite Crystals or Embers as WM on rewards, 252 ILVL weekly quests, Create hot spots where the objective is not to do an assault but to beat the dodo out of each other. or better yet learn from TBC and create wpvp objectives in the world again.
TL;DR: Give us a reason to turn WM on.