It’s unlikely that C/C++ are going to be replaced by anything anytime soon. While there are more modern options like Go (my personal choice) and Rust that try in their own different ways to prevent the many memory management bugs that often exist in C/C++ programs, sometimes, depending on what you’re doing, the methods they use can get in the way of writing the code. In those cases, C/C++ are always a very good choice and will continue to be widely used, likely for decades to come. Also, there is so much software written in C/C++ that even if it was being replaced, that process would itself take decades.