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What do you reckon could not be legacy code in 15 years? C family, Java, maybe Erlang?
I expect the JVM to still be going; at least one of Clojure or Scala will probably continue growing for a long time, and there's room for both. It's also possible another Algol-esque language that isn't Java, but is syntactically closer to Java, making people more comfortable, will arise. At some point one of them may even become the "primary" JVM language, with Java hanging on as legacy, but due to the fact Java jus…
Rust looks promising, but it's way too early to tell if it can really replace C/C++.