Well, if Blizzard continues with it’s narrative of, “Horde bad, Alliance good,” I expect the travesty below to be what we would end up with.
Alliance: The Player-Character is contacted by Anduin and attends a meeting with Umbric, Alleria, Vereesa, and surprise guest, Aethas Sunreaver. Aethas gained this audience through Sin’dorei who had been visiting the Telogrus Rift, and informs the leaders gathered that Quel’Thalas has been nurturing multiple cells of individuals resisting the tyrannical rule of Lor’themar Theron, and that he believes the time is ripe for Quel’Thalas to be Liberated. Alleria jumps on this immediately while Umbric seems cautiously optimistic. Vereesa suspects a trap.
The PC then goes through Silvermoon City in a void-based disguise and puts up all kinds of propaganda to stir the citizens of Silvermoon into near revolt.
“Sylvanas Windrunner intends to end this war by handing Quel’Thalas over to the Alliance, claiming Kalimdor for the Horde. She suspects us to give up our homeland as she forced the Forsaken to give up theirs!”
“Who are our true friends? The Horde who have put us through countless wars that do not concern us? Or the Alliance who restored the Sunwell and empowered our people?”
“We call ourselves, ‘Sin’dorei,’ to honor the Fallen of the Third War, but have we done the opposite? Would Anasterian have suffered the likes of Orcs, Trolls, or Undead to walk freely through our streets?”
"The Draenei have been greater friends and allies to us than anyone in the Horde! Why do we fight them in Sylvanas’ war of extinction?
“Are you tired of everything you say being recorded by some unseen hand? Sick of bowing to every Blood Knight to walk by? The Alliance shall come to liberate us! When they do we must aid them.”
The Questline ends with the Void Elves, High Elves, and Draenei establishing a base in Eversong woods.
Horde: The Player-Character is summoned by Rommath to Sunfury Spire, where Lor’themar, Liadrin, Rommath, Halduron, and Thalyssra discuss the disturbing events, showing them torn down fliers that continue to mysteriously appear within the city. They interpret it as a move by the Alliance to destabilize the Thalassian Populace’s trust in the leadership of the Kingdom, and have the Horde PC go out to locate suspicious activity and interrogate anyone they find.
Unfortunately the Horde PC ends up interrogating innocent Blood Elves who become increasingly irate about that treatment and begin saying things like, “Maybe those posters are right!” Guards arrest those with this sentiment. Other interrogated NPCs flee in terror when you finish talking to them. Upon reporting back to Lor’themar, he grows furious and orders a Curfew and for the city to be placed under martial law, with a public speech about how Quel’Thalas is being attacked by dishonorable and duplicitous means, and to ignore the propaganda if seen, and to report it to Guards or Magisters for removal.
Shortly after this the PC is informed that the Alliance has established a base within Eversong Woods, using the Void to conceal their actions. Attempts to raise the Ban’dinoriel have failed, and Sylvanas has tasked Quel’Thalas with removing the threat with what volunteers they could find, as other fronts took greater priority.