Be all that as it may, I do have to wonder what the problem is here. Greene's sleeping with a teenage woman is gross to think about, but they were both of legal age, and even if she was just barely so, "just barely so," counts as legal. So far as I know, Greene applied no coercion other than his not-especially-dazzling celebrity, and as everyone knows, if a great many celebrities didn't do that (especially the not-especially-dazzling ones, and especially ones, like Greene, who have a face for radio) they wouldn't get any action at all; they're just as lumpy and furtive as the rest of us. . . .
I think Greene should have been cut as a columnist years ago, not because he's morally tainted, but because he's a boring columnist. He stopped being interesting and started being filler long before he did his questionable after-school activities. From a purely utilitarian point of view, there's no downside to Greene hightailing it out of town, excepting that there will be the painfully rationalized mea culpa six months down the road as part of Greene's inevitable comeback (America loves a reformed sinner).
But based on what we know now, this isn't the way Greene should go out.