I'm not advocating for one way or the other, but how can you argue with a locked up wheel scenario? These cars don't have ABS and in a panic stop you are going to lock up all 4 wheels and once they are locked up it couldn't matter less if there is a drum or a disk behind that wheel.
Most of the comments seem to be about what makes us "feel" safer, but are we really?
Like Bart said, I'd like to see some real data. I'm sure that disks aren't going to be worse than drums, so until the data comes along, I guess there is no harm in erroring on the safe side and putting disks on the rear.
Sounds like a job for Myth Busters.