My point is simply that niche languages are harder to hire for and find a job in. Most people aren't okay with that. There is a feedback loop here as less people use it and less libraries are written. That doesn't mean the language is inferior to Java in any way, but a new developer has to stay relevant by learning languages and frameworks that people use in-house. This is a major reason it isn't popular. I have 300 people in my IT department. They've all heard of Java & C#, but I've never run into anyone who has even heard of Lisp (maybe that is marketing).