One effect that I have always pondered (and admired) is this. They were accepted by the establishment. The only thing "radical" upon their arrival was the hair. The tunes were good and non-offensive to most. After they were established, things began to change. Not just the music. Here was John and Yoko getting live press coverage from a bed !!! Someone with widespread popularity and political respect from nowhere said something so radical as, "Give peace a chance." And more than a generation listened and agreed. Of course, humans are a bit more complicated than that but it still did make a mark.