I'm not really sure that this explains it at all. For one, there are sites similar to isitruby19.com - such as onpython3yet.com. What seems more likely to me is that python 3 was not as compelling of an upgrade until recently since a lot of stuff was back ported to 2.7. I don't know as much about ruby 1.9, but it is also seems possible that python 3 was simply more disruptive of a change.
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I'm not really sure that this explains it at all. For one, there are sites similar to isitruby19.com - such as onpython3yet.com. What seems more likely to me is that python 3 was not as compelling of an upgrade until recently since a lot of stuff was back ported to 2.7. I don't know as much about ruby 1.9, but it is also seems possible that python 3 was simply more disruptive of a change.