Thank you for the non-answer.
Knockturn is around because it's a part of Diagon, and that speaks for itself. This is more akin to "We need the Shrieking Shack!" during the Hogsmeade expansion talks.
What I'm trying to say is that Universal needs to be strategic with its space. We all agree that Emerald City and the Yellow Brick Road are essential components of any Oz expansion.
For those advocating for the inclusion - again...Why? What attractions or activities would make its addition worthwhile other than "Hey, it's a known location in the book/play!"