Here's the potential I see. Imagine if it was routine to write an application stack entirely in a repl language. Not just the application code - everything. You'd write your application code. Then other functions would dispatch the tree of application code to the LLVM API where it would be compiled. Then other functions could take the resulting artifacts and push them through to deployment.

Doing this at the moment would involve writing fiddly wrappers around lots of layers of technology - dynamically constructing makefiles, and shelling out to call things.