Physiologically, yes. However, most are things that people assume they have but haven’t bothered to find out if they do or not. Many people assume they have things that limit them from this time or that place and use that as an excuse to not try. In the end, you don’t know if you can do something or not unless you actually try.
Here’s another angle for you. Nearly any male without severe physiological impediments, if he begins training in the right way at early enough of an age can run 2:30 or faster. This is the angle I would take for this. I don’t think anyone who runs 2:30 has no limits. I’d go from another angle and say there are very few young males who have limiting factors keeping them from running 2:30.
Woody, I have to disagree here. I think there are a lot fewer runners doing 100-120 mpw, as well as getting in all the other variables needed for optimal race performance (remember, mileage is only one factor), than you think.
Yes! Almost nobody in the world knows their full potential in distance running. Most are selling themselves far short. They claim they can’t run sub-3, so why bother working hard to break 3:30? What they don’t know is maybe they are capable of breaking 2:30 if they would do what it takes.