John was the leader of the band in the early days & he lead them to the top, I think for John things had to always be developing/changing and attaining primacy and conquering the world (so to speak) created the problem of having nowhere else to go, so he started to let go. Paul didn't have that kind of restlessness and wasn't easily bored as John was, he continued to push, but I don't think he was ever regarded implicitly by the other members as the leader of the Beatles as John had been. Eventually the next big change for John was breaking up the Beatles, to me Paul is the one who most wanted them to continue, I think he did things that annoyed the others, but I don't think he could have done anything to keep them together. I think if John had wanted them to stay together they would have.