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How many runners can even run a sub-hour half marathon?
I think you're making the point that I'm making - that we're all making - that there just isn't the pool of talent available to even pace a sub-2 (unless you make it an unsanctioned race with pacemakers all around the course, starting at different points) let alone run the full distance sub-2 (without Nike's special sauce).
That's beside the point though isn't it? How many runners can even run a sub-hour half marathon? Pacing's all well and good but there's hardly any actual drafting effect. Sub-2 is so far away from what's been managed to date (in virtually flat city marathons with world-class pacers), it's just not gonna happen any time soon. Without lots of juice.