I'm pretty sure there are startups using any and all of the listed options, along with Scala, Erlang, Clojure, Haskell, Common Lisp, OCaml, Java, C, C++, Standard ML, Prolog, C#, Visual Basic, Ada, Tcl, Perl, COBOL, FORTRAN, RPG/400, APL, Pascal, JCL, PL/I, GW-BASIC, Whitespace, Befunge, Brainfuck, and Intercal.

IMO: Learn something you find interesting, instead of worrying about "what do I learn to get hired." You'll be happier in the long run.

That said, don't underestimate the power of "COBOL on COGS." http://www.coboloncogs.org/INDEX.HTM