I'd tend to agree with that, Valashar. One of the things I've always liked about Harlequin is that he typifies to me what most people would be like if they were granted immortality. After a certain point, having lived through so much destruction and death, and seeing both the highs and lows of civilization, you'd start to get a bit depressed by it all. Another nugget that struck me was a section from Portfolio of a Dragon where Ehran and Lady of the Court were talking, and it sounded as though Dunkelzahn's will had, among other things, shocked Ehran out of his millenia-old rut of scheming, and had shown him a bit of hope.
But that might be the romantic in me talking.