I've considered the "group" issue at length and do not consider it a major issue. People like us are obligated to improve the world for the less enlightened.
I wonder how rapidly this column wise deplaning breaks down in the face of random compliance and confusion.
I implore you to consider the group issue in more detail, and perhaps with a touch of human empathy this time.
The notion that ALL sets of 2+ travelers now have to wait at the end of the gangway just inside the terminal, the disaster that would create at the gate, is just kicking the can off the plane in a way that doesn't actually help the next passengers get on any sooner. The gate -- and all gates -- would be a disaster.
This really says everything you need to know about this "analysis".