Although the site owner should get educated here, I would be very surprised if this went anywhere. I looked at the site. There is ZERO commercial gain, not so much as a block of Google AdWords. It is truly the ultimate fan site. Also, although the owner did not have a DMCA agent, a member of the site was the one to upload the images. Typically I would expect this to go nowhere. However I believe the Carolyn E.Wright law firm has been known to file on looser cases such as this. So it's important to document everything and engage the support network here as much as possible.
By the way, do you think the photographer Carolyn E.Wright represents got a model release from Joni Mitchell?
I also notice that
http://jonimitchell.com/justice.cfm just says "To be continued." I wonder why. Remember, the truth will set you free. There is nothing wrong with posting factual information on your site and I don't think the owner of jonimitchell.com should be persuaded to do otherwise.