Doubling back on a topic from a few pages ago, Leaky Cauldron experience can't be mandatory. The math just doesn't add up. It'd be a capacity nightmare. Starting to think that the Leaky Cauldron brick-tapping will be in place but as an optional experience. Very similar to the magic of wand selection at WWOHP1, if you want the full experience, enter through Ollivander's, otherwise, enter through the Owl Post. So if you want all of the magic of entering DA for the first time, enter through the special Leaky Cauldron entrance, otherwise, walk around.
Parts of the Project 722 plans and ambiguous walls seem to suggest this as a possibility. Think about it: select one person from a group, just like Ollivander's, a wizard shows how to tap the bricks, said guest performs the magic, ta-dah!