NCAA fan-I'm going to respectfully disagree with you based on both my personal experience as a college athlete and as a current coach. Mostly I disagree because you are making very broad statements ("Collegiate runners should absolutely not be running marathons while in college") that may apply to some/most college runners but certainly do not apply to all college athletes. Everyone's strengths, goals and abilities are different.
As a college athlete, first a Nordic skier and then starting junior year an XC runner, I started doing ski marathons as a sophomore (50k). These were at the end of our preseason camp and before the start of college race season. My ski results after my first ski marathon were about 5 levels higher than they were before. I also feel that knowing what 2-3 hours of hard racing felt like made my transition into the 8k's/10k's of XC running a lot easier than it would have been. Now, I never had any talent so I was never going to be a fast guy, but starting XC as a 20 year old I never had any lack of confidence that I could make some people hurt out there because I certainly wasn't going to fade over 28-35 minutes. As a runner I didn't do my first marathon until after senior year XC season but I remember it feeling like an obvious next step. What's to say that Scherf doesn't feel the same way? Unless you have inside knowledge about someone you just cannot say that what they're doing is right or wrong.
As a current coach (runners and skiers) I would say that over the years probably about 50% of my athletes race a marathon before they graduate. Of last fall's roster 2/3 have raced marathons or halfs. Of last winter's ski roster 1/2 have raced 50k (and they all had real good results). I don't coach our Women's XC team so not positive on the stats but it looks like 5 of 13 have raced at least half marathon, and 3 of the 5 freshmen from last fall just ran a May marathon. We don't have Track (well, Track Club but that's not the same) so that changes things a lot. I'm sure if we had to get up for 2-3 "peak" XC races in the fall plus 4-5 "peak" Track meets winter/spring we'd have different priorities.
We are a distance based training system, but we are absolutely not just training college kids to get ready to run/ski marathons after college. We deal with injuries like any other program does, but I don't think we see any higher incidence of injury due to our kids running marathons. In fact, I think that because we don't over do the speedwork we tend to get more long-term development out of our runners.
I'm not sure the argument has been made on this thread that too much too soon leads to burnout, which I hear a lot from other coaches, but our grads would disprove that. Over 70% since I started coaching have raced a marathon, and somewhere between 75% and 90% of my grads continue to be active in racing. In fact, out of our small DII program I've had 3 grads from the last 5 years who have cashed decent checks out on the roads.
From my experience as an athlete and a coach, it isn't "racing a marathon" that makes a college runner (substitute skier and it's still valid) better. It's "doing the training to race a marathon" that makes one a better runner. I can say without hesitation that I have not had a single runner or skier in my programs who was a worse runner after their first marathon than they were before.
I'm curious as to why you are so adamant that college runners should "absolutely" not be running marathons while in college. Personal opinion? Or anything to back that up? Just curious.