The main plot of Battle for WOW WOTLK Classic Gold Azeroth followed the veteran orc warrior, Varok Saurfang who was trying to win back an enclave of the Horde and restore their honorable role. King Anduin Wrynn the young and gentle leader of the Alliance had always strived for peace, and he assisted Saurfang expose Sylvanas as ineligible to lead. 

The whole point of this storyline was to break into the cycle Horde against Alliance culture, an effort that could soon change players their interactions with each other and also. The Horde switched their autocratic leadership style to an racial council who struck a ceasefire the Alliance which is likely to stay in effect for the rest of their lives.

The consensus among many fans of the lore is that they had become bored of the circularity between the factions. This change is likely to be well received by those who are interested in the mythology of WoW's Azeroth, as well as those who are casual or hardcore. 

There is some concern over a loss of faction identity which is valid however there isn't any obligation to interact with the other faction in any way, since cross-faction play is strictly optional. It would appear that going forward, the deep divide between Horde or Alliance players is something reserved for the content of past.

World of Warcraft: Classic, Burning Crusade Classic, and Season of Mastery are currently available for players to relive previous content when it was first released, and cross-faction interaction is unlikely to be altered in those games. 

Whether the decision to unite both the Alliance in the Alliance and Horde factions from World of Warcraft is one that can be looked back on as a universally positive change remains to be decided, however players have the option of deciding for themselves whether or not they're going to be able to buy WOTLK Gold live with the other faction in their own midst.