For scientific computing and advanced machine learning domains, Julia is certainly a breath of fresh air and a no-brainer decision. However, as a general-purpose language as well as technology stack, I think Julia has still a long way to go. This is mostly due to relative immaturity of that part of the ecosystem, spotty - and sometimes even non-existent! - documentation (of course, except for the language itself and quite a limited number of core and popular packages) as well as some other issues, including tooling, development/compilation performance and limited pool of skilled developers.
So, from a startup founder perspective [who has to select the optimal, risk-minimizing, platform stack], despite Julia's many attractive features (including powerful meta-programming facilities - in my case, for potential DSL development), I'm now leaning toward Python and .NET ecosystems. Both offer very mature and large package ecosystems along with comprehensive tooling support and incomparably larger pool of skilled developers. Additionally, .NET offers stability of consistent development improvements, backing of a major corporation [no acquisition risk] along with support for modern enterprise-focused architectural practices and patterns, including DDD and multi-tenancy.