More detail is needed. From what I understand, this rule does not ban the trailers, and that they could continue to be used for weight-balance adjustment and to store extra supplies, just not to carry dogs.  If your dog is injured, a trailer could be used to store supplies from the main sled, so that the main sled could accommodate the tired or injured dogs.  In this way, you can keep an eye on the dogs, rather than trusting their welfare to a tailing sled.  I'm just not sure folks should look for other motivations coming from the iditarod board in this issue.  BUT, I would appreciate more detail on how the decision was made.