Walls of Babylon are already represented in the Hanging Gardens model by the Ishtar gate.
Bowman and Scribe School have utterly no flavor. Nubia has the more iconic pitati. And to date only the "thermal bath" and "stave church" have not been uniquely named buildings (and electronics factory which is modern enough to get a pass). And still, both have clearly iconic designs and are indisputably Hungarian/Norwegian structures. What was a scribe school called? What would it look like? This is a terribly thin concept.
My point stands. Players do not think ideas through. Next.
How strange. In a discussion of Civ VII you are dismissing ideas right and left because you have made the totally unwarranted assumption that the Wonders, Civs and their attributes of Civ VI will remain the same in the next iteration of the game.
Just for starters, Civ V had both the Walls of Babylon and the Hanging Gardens. Whether the combination will or should occur in Civ VII is a legitimate discussion but you can't dismiss either one by saying, essentially "this is the way it's represented in Civ VI so that's it."
That has never been true in the Civ Franchise, and I don't expect it will be true in Civ VII.
Now as to Scribal Schools, that's another story: never have been in Civ, but to me, IF they were to be included, they would be a mechanism for adding a Science Boost to ancient Civs, but not necessarily Sumer or Babylon: scribal schooling was also an Egyptian phenomenon.
This then, should not necessarily be a Civ Unique, but rather a development that requires a set of prerequisites so that it cannot be Universal. Perhaps, for instance, a Scribal School would be a building in a Holy Site (assuming, of course, we're going to keep the same Districts, or any districts, in Civ VII - I think they will) Instead of a Shrine - so that you have to make a potentially Painful Choice: religion or science.
Another possibility would be to make the Scribal School a building that can take the place of Either the Shrine in the Holy Site, or the Monument in the City Center - in Mycenean Greece and Minoan Crete there were lots of written lists and tablets, but they all seem to have been stored in the Palaces and 'administrative centers' instead of associated with the temples and priesthood: let's explore the alternative developments.
Then you'd have the explicit choice of Religion, Culture or Science: can't have all three simultaneously in those Very Important early stages of the game.
My own preference, just to throw mud into the waters, would be None of the Above. I'd like a vastly expanded and more flexible system of Specialists, with every single Building and Wonder having Specialist slots, but considerable potential flexibility in what kind of Specialist goes where.
In this (very early stages of thinking about it) system, the Scribal School as a concept (probably the equivalent of a Civic rather than a Technology) would allow you to place a Science Specialist in either the Palace or the Shrine. In the Shrine he'd take the slot away from a pure Religion Specialist, so you'd get less Religion from the Shrine but a bit of Science instead. In the Palace, he'd take the place of (potentially) an early Military or Administration Specialist, so you'd be trading Science for Military or Loyalty.
In every case, getting Scribal Schools would obviously depend on having some kind of Writing, and also having some kind of basic administration, since the earliest writing seems to have been lists to keep track of goods/food stored for later distribution.