I think you're right about the possibilities here and I love the idea and have thought similar things myself too, but to me the inclusion of a 3D element should probably be a format, not necessarily locked into any specific app such as Blender. Maybe (Pixar) USD is one possible format that could be used for general 3D interchange for this kind of thing?
Imagine opening blender and typing
> A medium sized classroom, well lit, with two blackboards and many geography posters
And the AI just generates all the 3D meshes and places them appropriately.
Repeat that for other props or characters that you need. After that you can manually tweak the scene as you currently would (moving things, etc).
Then you select a character, and to animate you tell it
> The character calmly walks to the door and proceeds to open it
You could literally do a 100+ hour job in 5 minutes.