So as we know, the Void elves will receive Dark Ranger customization options in 9.2.5 This means that, storywise, a portion of Dark Rangers that once served Sylvanas and the Forsaken, have defected to the Alliance. For many years, Horde players denied the Alliance any right to Lordaeron on the basis that all those who stayed to defend Lordaeron were now in the Horde (Forsaken).
However, now the Alliance has a new claim to Lordaeron, thanks to the aforementioned Dark Rangers who have joined the ranks of the Ren'dorei, and will be playable in 9.2.5.
We also know that High King Turalyon seeks to reclaim former holdings of the Alliance, after the success at Stromgarde, and Lordaeron City would count as a former holding (and former capital) of the Alliance.
Is it fair that Lordaeron remains in the hands of the Horde, when a portion of those who died defending it are now in the Alliance? I believe that Calia should simply share Lordaeron with the Alliance, after all it is only fair that those Dark Rangers would have the option to visit Lordaeron, even though they personally aligned more with the Alliance's ideals than the Horde's.