While Trollbane want to go back to azeroth, he explain that he is duty bound to stay here under order of the king. That's when one of the guild leader remove her helm and tell him that after all that time, isn't it time to finally go home even if Varian seem to have decided to forget him here. Looking at her face, a memory of a long time ago come to the front and he suddenly remember her face as the one of Calia Menethil.
She explain to him that even if Capital City is now the Forsaken Capital, that doesn't mean that they have the right to all the Kingdom of Lordaeron and that after what they did to Southshore and Gilneas it is time that someone finally put a stop to their dangerous expension.
The surviving Sons Of Lothar pass over the key to Honor Old to the Nethergard Keep force and use portal to go back to Azeroth.
Soon, the Son Of Lothar with the League of Arathor under the new command of Danath Trollbane, the wildhammer dwarf and the adventurer's guilds under the Command of Calia Menethil, retake Stromgarde and pusch back the Forsaken behond the Thoradin's wall.
When the Forsaken learn that both Danath Trollbane and Calia Menethil are back and ready for a fight, they rebuild Durnhole, Alterac and fortify Strahnbrad. The Orc call back Nazgrel from Thrallmar and send him to Hammerfall where he quickly fortify the place and make it ready for heavy fighting.
That would give a new open world pvp zone like the Tarren hill/Southshore and Crossroad/Astranaar, give the Alliance player the foothold in norther EK that they have been asking for so long and the retaking of Stromgarde and the defense of Hammerfall could make 2 good scenario. After the scenario, we could then have the new zone in phasing.