This is right on, ++. A career is much bigger than the languages you know; it's about the kind of work you want to do and being competant enough to know and use the right tools. If you are doing the right kind of work, you will probably enjoy using the tools, even when they change.

I've used C for a long time, and could still find work with it if I wanted (it was supposed to have died off long ago due to C++). While it was the best tool for the kind of work I was doing, I enjoyed using it. As my work content changed, it became cumbersome. I found Perl was a much more efficient tool, and now I use it and enjoy it.