Isn't this true about any conceivable hypothesis?
Yes, but most hypotheses don't take the form, "Why am I thinking about this hypothesis?" and so your comment is completely irrelevant.
To elaborate: the doomsday argument says that the reason we find ourselves here rather than in an intergalactic civilization of trillions is because such a civilization never appears. I give a different explanation which relies on the nature of anthropic arguments in general.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.