What impact would John Lennon have had if he were still alive today?

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This question occured to me, strangely, while watching the finale of Americal Idol this week. John Lennon songs (solo and with the Beatles) were covered a few times. In particular, Green Day's moving version of "Working Class Hero". His picture was also shown. He seemed to be part of the spirit of that particular show (not the whole series), which was pretty good, IMHO, because of that spirit. He has become a huge cultural icon, and would seem to be still an inspiration to many. More so than any other artist, living or dead, I believe. I thought it would be interesting to consider how things might be different if he were still alive. I expect, and hope, that he would be still the radical, humanist artist he ever was, and working in some medium (hopefully music among them) and for causes, such as world peace. Of course, he may have become just another reactionary, or a recluse, or he might be pedalling mediocre nonsense (to put it politely) like McCartney. But I don't think so. He is revered now as much for his unfailing integrity and intellect as for the fantastic songs, and this would not have diminished. He would have had much to say on current wars, commercialism, terrorism, even the Internet and other apsects of society. I think he would have focussed thoughts and brought people together for important causes. Anyone else have thought on this topic?