I don't know why people need to settle on the most dramatic conclusions.  I guess alarmism sells news but it is really not helpful when trying to form scientific hypothesis.  First everyone likes to pick his or her favorite enemy.  Here it is transgenic crops, which without really knowing anything about them, one concludes that they must be bad.  Although the jury is still out one would suspect if this were the cause of colony collapse it would have been noticed in North America years ago and on a large scale.  Whatever is causing colony collapse is relatively new and there could very well be a number of reasons.  The collapse of colonies and the increase of parasites and fungi are not surprising since the colony functions as a `superorganism'.  Once the number of individuals drops below a certain level there are no longer enough bees to care for brood, or forage, or defend the colony and maintain homeostasis.  It is likely that some strains of bees are resistant and certainly there are other pollinators, although agriculture is not geared up to utilize them.  My guess is that it is a pesticide and probably a recently introduced systemic one, unlike Bt it is a general insecticide.  If so, other pollinators would be just as affected as honey bees.  The mystery will solved shortly.