2013 was pre-LLM. If devs continue relying on LLMs and their training would stop (which i would find unlikely), still the tools around the LLMs will continue to evolve and new language features will get less attention and would only be used by people who don't like to use LLMs. Then it would be a race of popularity between new language (features) and using LLMs steering 'old' programming languages and APIs. Its not always the best technology that wins, often its the most popular one. You know what happened during the browser wars.