I absolutely love this idea! I have a few couples that I have talked with and we have really wanted to have a swap party. My only thought is, the number of poses it would take to make it realistic would really make it difficult to develop. It would also be quite expensive unless the poses were made available by character so that each person was responsible for their own poses.
But love the idea! If they ever develop it, I'll spend whatever it takes to get the poses for this one if it's well developed!