When people said they like events they mean events that are titled events so that people have an expectation of them being timed events. This just seems to contrived. Well time for battle no more supplies needed pack it in and hope we have enough arrows fellas. And does barrens go back to simply the barrens it was before or will it be dynamic itself. I mean I would think most of the overturned wagons and random bits would be left to the wastes. The big black pits should remain near the oil I mean oil fields don't just go away. What about all the logging there should be a million tree stumps leftover when the "event" ends. There should be carcasses of all the dead animals that were slaughtered. The buildings should remain as well if the men are going off to battle they can't rightly have time to break down all the buildings or maybe set fire to them and leave them to burn.
Heck you would think the goblins would move in and set up camp in those old areas to harvest what is left once the collectors have gone off to war. The goblins can see there is money left to be made and would take advantage of it probably even offering to sell the precious items left behind like the trinkets and griftahs shoes. Where is the lore, the storytelling is all just a pile of sticky notes in the trash because big business decided it's just not worth it to advance the lore just end it here, garrosh is the bad guy alliance wins yadda yadda collect your purples and don't let the door hit ya on your way out.