I would think a language like that could speed up knowledge base construction. Maybe it can also serve as a substitute for natural languages in some situations where we want our communication to be logically airtight.
[1] https://en.wikipedia.org/wiki/Lojban
[2] https://en.wikipedia.org/wiki/Attempto_Controlled_English
On a separate note, I've always wondered how Cyc is pronounced. Is it "sike", or is it "see-why-see"?