I think the whole "can Old Gods really die" thing has gotten a bit misconstrued myself. The Titans are, lets face it, extremely large entities, and the ones that fought against the Old Gods were probably a lot more massive than the ones players have encountered. Due to this, its reasonable to assume that players can do what the Titans couldn't (kill Old Gods without blowing up the world) because their smaller size lets them attack more precisely. Keep in mind that fighting C'thun required players to attack from inside his stomach and fighting Yogg-Saron required entering his brain.

As to the whole revival thing, I believe that using C'thun as an example is not the best of ideas. Blizzard seems to be developing a habit of reviving vanilla bosses (Onyxia, Nefarion, Ragnaros... all of Naxxramas) because so few people were able to fight them in their prime. It's probably best to see C'thun's revival as a quick in-game explanation rather than an actual development. After all, considering how powerful the Old Gods are it seems like they should be a lot harder to revive than by what Cho'Gall did.

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