This is really an interesting question, and I’ve pondered it for a few days before replying. I think the basic answer to the question is that it depends upon the goals of the student and the open-mindedness of the instructor. I’ve been teaching piano at the college level for over 20 years, and you can imagine that I have seen all sorts of student walk through the door. Before we even begin, I question them about the type of music they listen to and any significant event in their lives that led them to the piano in the first place. This is often very telling! I also ask them what “dream piece” they envision playing in the future once there is sufficient ability to do so. It definitely gives me an idea of how to proceed…
One thing I consistently find in common among all of the new students I teach is that they all struggle with technical limitations that are exacerbated by insufficient knowledge of the operational language of music, regardless of the style of music to which they gravitate. The trick is to find repertoire or examples of music within the preferred style that will help the student achieve technical and musical success, enlighten them to deeper theoretical concepts that make music work, and thus lead them on a pathway to advanced physical and mental refinement. This is where the open-mindedness of the instructor comes in. To explain this I will provide a little anecdote: My mother was a huge fan of Elton John, and I always remember as a child listening to some of those great songs from the 1970s and being fascinated by the way he played the piano and how beautifully his voice fused with the instrument. Upon voicing my interest, my mother bought one of the Elton John song books that existed at the time, and when I opened to some of the songs I particularly liked, I was astounded at how technically and musically challenging the songs actually were! Now, I was only 10 years old (I started playing when I was four), but I realized at that point that there was a lot more to do before I would be able to play some of the things that sounded so easy on the record. When I brought it to my teacher, she agreed with my assessment!
The point I’m trying to make here with this story is that regardless of the style of music a student may be drawn to, there are fundamental musical and technical skills that apply to all of those styles that students must master before they are able to proceed to more challenging examples within that repertoire. I think we all know this. Considering the sheer amount of repertoire from, let’s say, Bach through Bartok, it makes complete sense to me that instructors will draw from the ample resources in that genre to teach those fundamentals in an organized way which could then be applied to the other genres like jazz, pop, and contemporary.
I suspect, however, that once students are exposed to more of the repertoire in the classical realm, they become attracted to many of the pieces that have stood the test of time. They may discover the greatness of Beethoven in one of the Sonatas, or the undeniable attraction of Chopin in one of the Nocturnes, and so on. So I don’t necessarily think that young people are being “steered“ into classical music, but rather, they discover it on their own in an attempt to achieve better technical and musical control of the instrument over time.