If this gets really good, maybe we can dream of having a fully de-obfuscated and open source life. All the layers of binary blobs in a PC can finally be decoded. All the drivers can be open. Why not do the OS as well!
Decompilers already exist and are really good. If an LLM can do the same as these existing compilers, you can bet the lawyers will consider it an equivalent process. The main problem is legal/political, not technical.
I don't know if I'd call the output of modern de-compilers "very good", not for native code anyway. They're just a little better than raw disassembly. Even state of the art de-compilers struggle to reconstruct control flow, distinguish data from code, identify the presence of a variable, let alone its type, and they fundamentally lack context. If a LLM could be used even just to reliably reconstruct symbol information it would be game-changing.
Decompilers already exist and are really good. If an LLM can do the same as these existing compilers, you can bet the lawyers will consider it an equivalent process. The main problem is legal/political, not technical.