Thanks guys,
For the 744 freighter there is a tailstand capability. However, this is not available for the pax aircraft. That is why I asked the original question about how much of an issue this really is for a deplaning out the rear door for this or other types without tailstand capability for this or other aircraft.
I hadn't really thought about it before but it seems like it may be a good idea to do what was done in the example given in the original post.
Has anybody heard of an incident resulting from a non-normal deplaning such as this.