I get what you're saying but consider this. In the beatles time there were simply less choices in music, that's a fact. Also you have the fact that the beatles were one of the first musical groups to use televised media and with far, far, far less things on television everyone that had a television at that time not only knew who the beatles were but had seen them play. Finally take into account that at their time they were pretty much the only major musical group to take a major political stance so they were galvanizing.
Put the beatles in our time when everyone's on TV, there's a million different forms of music to choose from and watch on TV (My TV has over 50 music channels alone), and everyone from the dixie chicks to System of a Down is preaching politics to the point of annoyance and yeah, they just don't have the impact.
They led the way in a great deal ways and changed music forever, but they also had the advantage of being the right band at the right time.