I suggest there be an alert/notice of some sort at the top of old shops and galleries (on all pages of the shop/gallery, like "Edit Items", "Profits" etc) linking to any information and help on the new shop system (FAQ: Shops would be the best thing to link to). I keep noticing that people who return from a very long hiatus or inactivity/absence (and missed the drama of the new shop system coming out a while back) almost always ask about what happened to their old shops and galleries.
(In fact, maybe certain areas should link to certain parts of the FAQ so people can find help quickly? For example, linking to the User Dashboard part of the FAQ in the User Dashboard page...)
I have a similar suggestion ">here but I'll leave this open since it is calling for linking the FAQs, which I think is a better thing to link it to honestly. I still support this though.