I think the greatest motivation for literate programming is providing context. After five minutes of reading, you can have a very good high level understanding of a complex program. This just isn't achievable in the same amount of time otherwise.
In that vein, you should consider the ability to coordinate a project using literate programming. It is hard enough to understand a code-base in a single file, but when a project has several different directories with a variety of files in each, having a starting document that describes all this structure is extremely important. And one can write the compiler to use that starting document itself to generate that complex structure.
