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I guess that many software companies are hiring Unix/Linux programmers to port their Windows programs. Linus himself believes that paid/closed-source software may co-exist with free/open-source
But I do believe that free/open-source is the panacea and will solve all our problems, so we can safely bet that paid software is doomed to disappear unless it's for very specific needs and customized to XYZ enterprise
As a programmer you never stop learning. You become better at what you do and learn new things in the process. I've found C++ and Perl to be my 2 most useful tools. But that's not all I know.
What you learn will be relative to what you want to do. The kernel is written in C. Most new software is written in C++ or a higher level language. Java seems to have its hotspots like real-time and web applications.