At the moment, I think that old languages with small communities are slowly fading away. There might be people, who still use them, however the numbers shrink by the day. Imho, Cobol and Ada are some examples.
Imo, in the short-term, languages which do not provide security mechanisms and modern features, like proper multiprocessor support, and are inconvenient to the developer, will have a hard time and fade away. I think Perl, Object-Pascal and Objective-C are candidates for that.
In the long-term, most languages will be deprecated and replaced by languages which fit better into the tech-world of the time. There might be a few exceptions, which stick around very long, because they are standardized on a grand scale (for example ECMAScript derived languages, JavaScript in particular). This will even affect today's most important languages, like C++ (people rumor that Rust will deprecate it) and GLSL (with the introduction of SPIR-V, even C and Rust become possible languages for writing shaders).