The difficulty in languages is not in having good features, but getting people to use the language at all. Existing human languages mostly solved the adoption

The difficulty in languages is not in having good features, but getting people to use the language at all. Existing human languages mostly solved the adoption problem because you want to speak the same language as the people around you. I don't think Lojban has reached that critical mass yet. Programming languages have other ways of increasing adoption, such as offering libraries that are tightly coupled with that language. If there are interesting literature that are only available exclusively in Lojban, that might have been a good motivation to learn the language, assuming that they can compete with the heaps of existing work written in languages we already knew.