This is a really significant point. I mean, I love SICP. I think Scheme is elegant as hell. But I learned to program with Basic in high school, and SICP in Scheme would have seemed like a huge step backward. I know Fortran did, which was my first college-level experience. I can appreciate Scheme now, but I don't think I would have then. And I can only imagine how "kids today," who have grown up on real languages would feel ("real" in contrast to Basic, not Scheme).