Like Sylvanas
When you sayd "want Lordearon back", I presume you mean "want Lordearon back in human hands, Alliance hands or both".
Anyway, I don't "want it back", I'd prefer if Lordaeron could be the kingdom of its people, living or undead. But (un)fortunately not everything is the way I want.
Reasons I "want Lordaeron back" (and I don't, let's just use that phrase for a while) are different. Alliance should simply have more lore and focus toward reclaiming Lordaeron and/or war with the Forsaken in general, and I think one could list many reasons. Forsaken are expansionistic, a menace at least and a threat to life at worst. Many Lordaeron refugees are in Stormwind, many more fled Hillsbrad or died there, they should be much more emotional about fighting there. There are humans in Arathi, who are literally next to be mercifully raised with their free will kept so they could say "FOR SYLVANAS" right after that, or whatever is that nonsense about free will of the new generation of Forsaken. Minions of the Lich Queen already started pushing in Arathi, and Hinterlands as well, where we have dwarves and elves (and draenei as of recently, because Blizzard did not know where else to put them). There are also dwarves south of Thandol Span, who should be next target if north falls to undead. And I did not even begin to mention Gilneas, Kirin Tor lands, Ebon Blade, Argents, possible Alterac humans who should maybe try reestablishing connections with the Alliance in order to simply survive, or even possible threat Sylvanas might be to Quel'Thalas once the entire north belongs to her. And don't start with "she loves her people" and "they are only retaking blahblah". She doesn't care about her people any more than she cares about any other tool, she needs more meat shield between her and the hell that awaits her, it's only the coincidence that her interest is also strong faction of Undercity. And her people are basically without any free will, since they behave as drones of the Queen, they might as well try to "retake" Mulgore if she orders it.
tl;dr, I don't want Lordaeron back, I just want more sense in the story, and that will happen only when Alliance and LOLneutrals (and maybe even the rest of the Horde) start treating the Forsaken like the threat they are, and maybe, just maybe, trying to actually do something about it, not because it will benefit them, but because waiting, watching, doing nothing and being "oh so concerned" (stupid Tirion) will only give Lich Queen and Forsaken more time and opportunity to become even greater threat.
Even if they are no threat (there are people who preach Forsaken are not evil zombies, but more like cute ghost Casper who wants to make friends), they should be perceived as such by Alliance and plaguelands neutrals at least and they should act accordingly.