I don't know about this is it for the tea shop. If you think about it, the front facade was not expensive for them to do, it is the props in the window that cost the money. So down the line if they open a real tea shop, those props can just be moved over to the new store and they put something else in that window display. The money wasted would hardly be anything. I think it all depends later on the guest surveys as to whether the dual wand shows are needed. If it slows down and the one over in Diagon is enough, they will close it down and probably put a tea shop in. But if the demand never reduces in Hogsmeade then we will get the dual wand shops. They can still sell wands in Diagon without the show, so they won't lose out on sales.