I wondered about this. I really want a wand, and the Ollivander's show would be fun to see, but I don't want to take a spot away from a kid whose whole trip might be made on this one experience. Yet I want a wand from Ollivander's! Glad to know I can still go in and get one.
You can see the show, but you will probably not be selected to see which wand "chooses you." They usually pick a kid to be the star of the show (for lack of a better way to describe it). I don't think being in the audience takes anything away from a child.
I thought right now they were doing sign ups for the show in the morning and only allowing one group in at a time. Either I misunderstood, or it's now back to the way it was.
I am not sure what the current procedure is. If what matters most is getting a wand and not seeing the show, you can buy a wand without seeing the show and give an open slot to a family with children.