* Python - As a programming language for scientists and researchers, replacing Matlab and kin.
* Go or Rust - A well-designed, modern language, easier to use than C++ but almost as fast, for enterprise applications or video games. Not sure about Google, but I hope Mozilla will still be around in 10 years.
* Lua? - Not sure about this one... but it fills a niche -- extremely compact scripting language.
* C - still used in system-level programming
* C# - C# is replacing Java as the OO language of choice for big enterprise systems.