Really? If you don't randomly flit from fad to fad you are "doing the wrong thing"?
That wasn't what I suggested at all. My point is that you shouldn't be so focused on one language that you can program in that and that only. Even just being bilingual is a massive step forwards in overall programming skills rather than ASP.NET skills, or PHP skills, or...
Obviously I can't tell what you meant to say, but it is what you did say. "If your thirteen year old technology choices are still having an impact today, then you're doing the wrong thing regardless". My thirteen year old technology choices are still having an impact today. You explicitly said I am "doing the wrong thing". I believe that is incorrect.
That wasn't what I suggested at all. My point is that you shouldn't be so focused on one language that you can program in that and that only. Even just being bilingual is a massive step forwards in overall programming skills rather than ASP.NET skills, or PHP skills, or...