Quite true. So What by Miles Davis has only 2 chords, and it's one of the all time masterpieces of jazz. As for stairway though, the intro section has more than three chords, even if some only last for a measure, but the end only has 3 chords. Whatever, its a cool song.
However, I also sometimes get tired of the same kind of three chord rock you hear so much. I listen mostly to jazz, which (in modal jazz) sometimes doesn't have many chords, but sometimes (in bebop) it does. I think having interesting harmony elevates solos to a new level, because notes can take on so many different meanings in relation to whatever chord you're playing, and stuff can sound so cool that wouldn't sound nearly as interesting without complex chords behind it.