If Disney wants to pursue this they have a good opportunity to do some fun things with the shop. During Colonial times a lot of goods were shipped from overseas. It would be fun if this shop became a bit of a curios shop but with a supernatural twist to it -- almost in the same light as Rolly Crump's "museum of the weird". That way they maintain the Colonial theme of Liberty Square while relating it to the Haunted Mansion. Painting the interior black and purple and selling plastic key chains would be a huge mistake.
Snapshots or a video from the ride??....sounds pretty standard. How about a lenticular portrait of yourself that changes to a ghoulish caricature like the ones hanging in the Mansion? That would be cool. They would only have to resolve the anachronism of having photography in Colonial America -- perhaps the images are something that look like they come from a printing press? ...or conjured from the supernatural?? (a.k.a. HP LaserJet with a wooden box built around it.)