I quit games or companies before, because I did not like the path they were going but I never did it in the sense of “haha, now take this, I am gone and you will regret it”, as that won´t give me any pleasure and the same it is with WOW.
When I unsub, I will write them about the guild bank situation and how they lack housing and a better system for the auction house. That their CM´s are not working with the community anymore and that I miss fresh ideas for the game.
But in the end, it won´t give me somekind of satisfaction or revenge, it´s just that their views and mine, don´t match anymore and losing my items was just the final stone that brought the wall down.
If someone stays, then I doubt they support the tactics here, but they may have friends or fun in the game and throwing all that out of the window, because of this, could backfire and people lose even more than just their items.