Interesting article and, in my mind, well researched and thought out.
I had never considered the issue of posting pictures of the quilts I've seen at quilt shows until I was acting as scribe for our judge at the last show and she mentioned having seen a particular quilt before - that had been posted online - by someone other than the quilter. For our show, it was a non-issue, but my understanding is that there are some venues that are pretty restrictive when it comes to judging quilts that have been "published" in some fashion - even if accidentally by someone unknown to the quilter.
Cheers, K