The writers intent may have been that the curse was broken, but I don't think that was the final intent of the filmmakers (dir and prods) and edit staff at all. I think the film doesn't present the possibility of the curse being broken very deliberately, because it takes away from the emotional...
loved it, thought it was a tremendous movie that made the disappointing second film much better. I'd definitely see it again. I didn't think it was too convoluted or too long, in fact, unlike the second movie it felt just right, not quite up to the greatness of the first movie, but a damn close...
if there's any weekend for a trailer to come out it's this weekend, but one will probably go out with Meet the Robinsons as well, I'm surprised there wasn't one attached to Wild Hogs.