Also, most languages are not sinking ships. Certain uses of them are of course. But even languages this site hates, such as C, C++, C#, and Java have very long lives ahead of them for certain uses. Obviously C++ vs Rails... well, you're going to be out of a job. But if you were using C++ for the sorts of things you would have used Rails in 2009 you were already a decade or so behind the curve.