You can't learn talent. You can learn perspective, proportion, etc, all that bullshit they teach in art classes. But, if you don't have the natural born skill, it won't make much of a difference.
Things wrong with this reply:
a) The question is not whether you can learn talent. The question is whether you can learn Drawing. Drawing is not a talent all by itself. You can draw and not be talented. You can be talented and not draw. You can be somewhat talented at drawing, but very creative. You can be somewhat creative, but very talented at drawing. You can be neither, and still be good with visual communication. You might be a horrible at drawing, but excellent at directing movies, documentaries, or films. You might be a great painter, but a bad sketch artist. You might be a horrible technical drawer, but a great cartoonist. Once again, the question is not whether talent can be learned or taught. The question is whether you can be taught to draw and the answer is yes.
b) perspective and proportion, and all that other stuff taught in art classes aren't bullshit at all. I don't have a clue what you mean by that. an extremely talented self-taught artist might still be horrible in their understanding of proportion, scale, movement, contrast, rule of thirds, symmetry, closure (the "et ceteras" you speak of) and somehow naturally talented at making an illustration look pleasing to the unsuspecting eye. for example you may have never gone to art school, but you're amazing at graffiti.
I can understand what you're trying to get at but the simple fact is you're still not on point even if part of what you're saying is valid