Greenspun is assuming that a "perfect" dating solution would result in zero people who want to be married who are not married.<p>This is a pretty odd assumption. Let's imagine that my mythical friend Tom desperately wants to marry, but is kind of picky: he wants a supermodel who is also an expert Python coder and who can beat him at Tekken 2. Since Tom is poor, has rather poor personal hygiene, and weighs about 200kg, we can safely say that he will be involuntarily single his entire life. Does his existence mean that all dating methods and tools are doomed to failure? I'd say no. Much like there will always be some structural unemployment, there will always be some "structural" single people. At best we can just reduce the number slightly.<p>And this isn't the only flaw in Greenspun's argument. As others have pointed out, he is assuming that the only purpose of online dating sites is to get married - and yet a cursory examination of online dating sites and the people on them would indicate that this is not the case.<p>Meanwhile, Greenspun's reference to marriage statistics is deeply problematic:<p>1) First, and most obviously, correlation is not causation.<p>2) He phrases the argument in the context of "low marriage rates prove online dating is a failure", but he then turns to statistics that show <i>falling</i> marriage rates. He seems not to realize it, but what he's actually arguing is not that online dating is a "failure" that has failed to improve marriage rates, but that it is actually lowering marriage rates. This probably needs an explanation. How exactly is eHarmony destroying the institution of marriage?<p>3) When pressed in the comments, he talks about "involuntarily single people", but again, the statistics he references are relating to marriage rates. It's a bit like trying to show that fewer people are starving to death by pointing to rising obesity levels. An obese person is almost certainly not starving, but not all non-obese people are starving. And a married person is probably not involuntarily single, but not all unmarried people are involuntarily single.<p>4) Don't falling marriage rates <i>actually</i> show that what people really want is, incrasingly, <i>not</i> marriage? Revealed preferences, and all that? But if people don't want marriage, then we can hardly use low marriage rates to show that online dating is a failure. His statistics would seem to not just be irrelevant, but to actually undermine his own argument.<p>(Yes, I know, I'm overthinking this.)