Sorry, AD, but I'm with John here. Kurtz' reasoning is self-referential and his argument is circular. He provides no evidence for his findings other than his belief in his own point of view. On that aspect alone, one can only discount what he says.
My personal view is that if the institution of marriage cannot survive the belief that love itself is all that really matters, then it is a sick bird indeed and probably not worth saving. Needless to say, I do not belive that this is the case.