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Except, C'thun's status has been regarded as dead by everyone that knows who C'thun is. You're trying and failing to say that because you don't believe it that means it is true. Okay, a lot of people say Tupac isn't dead that doesn't mean he's in a Pink Cadillac with Elvis and Bruce Lee remembering the good times. C'thun's status was changed officially from "banished" to "dead", making him the first Old God to be killed by players. If you've beaten Yogg Saron in Ulduar, you also see that he is very much dead.

Because you don't know anything.

Except Deathwing has NEVER been confirmed dead.
Yeah, more conjecture. On two fronts. Okay, you're done. Let's just go the logical route, if Arthas had that kind of power at his disposal he'd have unleashed his army and waited in Icecrown until the war was over.

I saw three corpses on the floor, that is not enough. There is a corpse of Old god in Darkshore, And the glaive inside it has some meaning. (to prevent it regenerating)
There would also be some usefull definition of what is "dead" in warcraft. Sylvanas has died for example... So did Kel´thuzad. Medivh was dead for thirty years.
Factically it did not even slow them down...
Your presuption is that they can never come back. There is absolutelly nothing that guarantess that. Or can you guarantte it?
Even Metzen once stated that that is the beauty... Everything can be brought back there. With his overstatement : "Warcraft is about rebuilding and destroying Dalaran and killing Kael´thas for 57th time"
What is really your confirmation. Warcraft does not have ekvivalent of G-cannon. Blizzard take any story if it is good and does not mess up their plans. (Even War of the Ancients that ressurected blue dragons actually made Nexus war possible)
(how drunk they have been when they accepted circle of hatred I do not know... story itself would be good if book wasn´t feminist propaganda)
Knaak´s Sunwell Trilogy was there far sooner than Fury of the Sunwell was even an Idea in designer head.

He sits at icecrown and waits. Why he had not thrown his armies south? I do not know. Ask Metzen. Because they probably are not strong enough to win over both Alliance and the Horde. (would be a bit emberrasing if he would win... no more money to blizz) I guess Malygos´s draining of Ley lines does not help undead who are magical in nature...

So you're saying it's dead. So if that were truly the case, the heroes saw that and decided to leave Yogg Saron without a wound as the Titans watch on picking their toes, because that makes sense.

Sylvanas is dead. She'll never be a quel'dorei again. Kel'thuzad is dead. He'll never be a human again. The undead are not living, this would be why the Light rocks them.
I have no idea what this has to do with their death.
Yes, I guarantee that C'thun will never return because he's dead.

So until they bring him back HE'S DEAD.

That isn't what I asked. I asked why Icecrown is accessible at all. Why waste his time making gates if he could just make a force field and wait for his enemies to die off?

Heroes did all within their power... IF they could do more they would.

As for Sylvanas - even in Warcraft (well in RP books) there is a spell caled "Wish" It can restore undead to living state. (But this spell has so many drowbacks that only Titanis with their exceptional way of thinking actually use it safely. I never dared in RP, though my dragon mage knew it)
There is a way there to reverse almost everything... well If you can beat Nozdormu you can even mess with time... but I do not encourage you... Old gods are singularities in time and getting their attraction is not healthy, not to mention Nozdormu´s and his fligh´s)

Because "death" is not the end. Not even for mortal. What it means for Titan or Old god... well be my guest at theorizing as I am.

The only thing A'dal, the most powerful being in existence, could do to cure the Plague was to kill the person with it. That doesn't seem like saving anyone from an undead state to me, which is actually an example from lore rather than a sourcebook which very rarely agrees with canon.

Funny... How about Aman´thul? Norgannon? Pantheon does exist you know... Well if Algalon can be trusted that is...

Trinity locked within Well of Eternity also exists... I somehow think that they overpower even A´dal. Naaru are also titanic creation.
One of their "perfect" ones... imperfect races of Azeroth, corrupted and deviated from Titanic design, just prevail where Naaru and others (f.e demigods of Kalimdor) did not.

and: blizz does not use cannon same way like Lucas...


And Edit... Find yourself someone who still has Corrupted Ashbringer from old Naxx and go to the Scarlet monastery. Down in the cellar you can "reedem" undead to living state.