Alliance encroaching on Lordaeron (sans Calia) is no different than if Alliance were to "retake" Quel'thalas. They are foreigners invading territory that doesn't belong to them.
Well, I don't think they'd be loyal to the crown. They have a new queen. Someone showing up as the rightful heir doesn't account for anything as they are not under the kingdom of lordaeron anymore. They are forsaken now. And sylvanas is the queen of the forsaken.
First of all, everyone saying "Lordaeron belongs to X and Y has no claim!" is pretty childish and wrong. The Forsaken and humans are two powers who don't recognize each others' laws. Both sides have what they believe to be a legitimate claim to the land and to each side, they're right while their enemies are wrong. The Forsaken are largely comprised of the dead of Lordaeron, raised into servitude and later set free to try and make an existence out of whatever husks of their former selves they had become. They take up residence in the land they once had during life, zealously defending the only home they have against human invaders who would stop at nothing to take everything from them. Lordaeron is currently the only real place in the world that the Forsaken have.
On the other side of the coin, you have the humans. Many of them were once citizens of Lordaeron in one way or another. Some are refugees who's family lines were born, lived and died on those lands. Some are old Stormwind refugees from the first war who's sister-nation Lordaeron took in and offered a home for many, many years. They struggle to reclaim the birthplace of the Alliance. Some fight to reclaim their homes from what they see as an abomination. Others fight to try and restore the homes of those who gave them refuge in the past. Both sides here obviously seem to have very legitimate reasons for trying to control Lordaeron, but all it really boils down to is a simple "I want it". There are no rightful hands for the land to be in. The Forsaken currently control Lordaeron, so it's theirs. If the Alliance were to take the city, the sides would change and they would be the "rightful rulers" while the Forsaken would be "invaders".
Now the out of game reason is because Blizzard hasn't done anything to endear Stormwind to the players. It has and continues to exist as a generic backdrop for humans and the Alliance as a whole. Even now, Stormwind and the Humans are a cheap, bland and empty wrapper hastily put around the alliance and a lot of people know it. A lot of Alliance players are desperate for the nostalgia of Warcraft 2, the amazing symbolism (the stylized L is infinitely better than stormwind's baby's-first-kitty) and a rich story. That's likely why you see so many ranting and raving on the forums about reclaiming Lordaeron.
The threat that Sylvanas poses is a real concern. But that doesn't change the fact that the Alliance are still foreign invaders into Lordaeron and that their actions are more conquest based than taking out Sylvanas.
If it's not an elf, leave it on the shelf.
Only good Horde is a dead one.
I wouldn't mind seeing more storytelling (or even questing) about the Alliance trying to retake Lordaeron, but in they end they should (and likely always will) fail.
Forsaken players need those zones, to quest and level in. Plus, it seems kinda silly for zones to permanently change hands. Alliance doesn't need those zones, they already have their leveling areas.
BTW, most of my WoW characters are Undead.
in general i have no problem with the game never ending (i.e. with neither the horde nor the alliance ever beating and conquering the other)
i would like to see territorial shifts from expansion to expansion with general parity in the number of leveling and questing zones, as well as parity in the number of faction capitals.
I think the alliance should help all of those homeless people in westfall, before starting a new devastating war with the horde
"The truest victory, is steering the hearts of your people" Last king of Lordaeron said that, if the current king of the alliance cant rally his people behind him, he already lost.
"But the real thing about Draenor is that it's a very kind of savage place, it's kind of like Australia where 11/10 things will kill you, giants and poisonous plants and everything. I think it's going to be really cool." ~ Ray Cobo, WoW Senior Game Producer
OP you're worrying yourself over nothing. It will never happen anyway. We all know that as long as Chris Metzen is employed at Blizzard the Alliance won't gain anything.
And even if they do, it will be done in such a way that the Horde is still made out to be the either heroic honorable enemy who is graceful in defeat, or the innocent underdog who gets butchered by the menacing lunatics in blue.
Put it this way, the story will always be told from a Horde point of view when you've got a staff full of people who think of WoW as a Horde-centric experience. Maybe add some balance to that out in Irvine and we could see some real writing and story progression come along. But until then it will continue being the adventures of the lil' green people and their pointy eared and skeletal pals.
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Horde has always been playing catch up on the lore front as they only really started getting fleshed out in WC3.