Ada, Fortran, and even Cobol, satisfy the needs of a given domain: safety-critical environments for Ada, scientific computing for Fortran, business transactions

Ada, Fortran, and even Cobol, satisfy the needs of a given domain: safety-critical environments for Ada, scientific computing for Fortran, business transactions for Cobol. They won't be replaced in the next decades, and even some new systems might be implemented in them. Languages for production were often designed to address a set of (hard) problems, as opposed to general-purpose languages (Python, Java, C++, etc.) Sure, there are some web servers/apps written in Fortran or Ada. But those are examples of what the languages can achieve, not how they are actually used in production.