Since the student is usually a beginner there is a way to incorporate some of the concepts of RHCP into music theory. Higher Ground for example, the concept of an octave, and scale movement up an individual string. They would not just be spoon fed a RHCP lick. My experience is those that don't do both, rarely even get the RCHP stuff. Let's face it, if you don't practice enough to get Green Day you're never going to play. Those with a genuine interest in music always manage both.