Truth be told, were I set with the task of reviving Thor, I would hav gone about it a bit differently from the direction JMS seems to be taking it. Basically, I'd have it be that even without Those Who Sit above The Shadows, the universe won't allow for there not to be an Asgard. That's why Those Who Sit Above The Shadows came into being in the first place. To ensure that Ragnarok or no, there would always be an Asgard, thus maintaining a certain cosmic balance. Without them, different actions are taken. Asgard and it's associated worlds, or at least aspects of them, begin to bleed over into our world. Places and objects of Asgard lay dormant as objects and places in our world. The Gods and other creatures of Asgard find themselves reborn as humans (or super humans, as some begin to regain knowledge of their godly atributes). The only one who remembers everything (or, more acurately, the first one to remember everything) is Volstagg. He then, naturally, charges himself with the task of tracking down Hogan and Falstaff, The Lady Sif, and Asgard's royal family and reawaken their true natures. The quest is hastened as more hostile aspects of the nine worlds, such as Fire Giants and Dark Elves, re-emerg and begin wreaking havoc in our world. The culmination of the first storyline or two is the triumphant return of Thor to kick some major ass when it's needed most.