While the focus of many of its contributors remain scientific computing, and its use in academia is growing, the language in itself is very amenable towards more mainstream programming. For example, there are packages (at varying level of maturity) for HTTP Servers, HTTP middleware, templating with Mustache, Redis, database access, Logging etc. So I'd say, the language itself is very suitable for mainstream programming, and the library ecosystem around it is growing and maturing quite well for such a young language.

There is also a great interface to Python, giving you access to the wide range of its libraries.