I feel much the same way (though, considering I learned English at the age of 4 and never really learned much more of my parents' language after that, calling English my second language is grossly misleading). I feel a vague attachment just because my grandfather was a professor of Bengali literature and I'd like to be able to read his work, but I don't sweat over the fact that my grasp of the language is very basic. I don't need to use it too often, and people back in the "motherland" can worry about preserving the language or not.

The analogy to open source projects is spot on; while you might have some "emotional" attachment to a library/technology that you learned early on, you probably wouldn't make significant decisions based on that. I learned to program in VB5, yet I dropped it as soon as I learned Java because it was just an awful language (though I guess human languages don't really have notions of superiority or inferiority like some programming languages might).