Just pointing out that this has been discussed to some extent
here.
I'd like to promote the topic, but I'd like to see you deal first with your potential opponents likely retorts: that this is a negative mutation not a positive one.
So, how do you want to discuss this? As a discussion about the defining characteristics of humans (uprightness)? that micro adds to macro? That this is microevolution? That this is an example of what drives evolution?
It is an interesting topic, but I don't see good debate here as a biological evolution debate, nor as a theological issue.
If you want to have this opened in the coffee house, it can largely stand as it is, I suppose as a generally open discussion about the family and the ramifications it might have for theology and biology.