I had made a comment, before the thread break, about how if the Asgardians don't have the Bifrost repaired by the time of Thor2, it will look rather bad on Asgard.
Vartha replied (sorry, I can't seem to be able to quote it properly):
"Well I was
thinking about that the other night.
Makes me really wonder if these Asgardians even built the Bridge in the first place and Asgard is just another trophie of Odin's."
Exactly! If you can't maintain it, can you really count it as "your" technology?
Or maybe it was built so long ago that they have forgotten all their civil engineering. (Which would imply they're kind of stagnating.)