Once again we have the reading comprehension issue staring us in the face.
Let's start with asking where I said anyone lacks commitment? That's you, not me. Yes, I believe that nearly any fairly young and healthy runner can run 100 mile weeks if they commit to doing it and approach it intelligently. That does not mean that someone who decides he'd rather not run 100 mile weeks lacks commitment. He may have plenty of it and is just aiming it in another direction and I'm much more inclined to despise people who claim I've said things I haven't said because doing so makes it easier for them to argue with me than people who are fragile. If you want to argue with me argue with what I actually said and not what you've decided to read into what I said.
I never said that anyone should run 100 mile weeks and I even noted that for some even if they do run that much they may find that they race better on less. Benji Durden is a good example because he had a stretch where he was running well beyond 100 and not racing as well as he did at 80-90. BUT he only learned that by running well over 100. And it's worth noting that he was able to run well over 100 a week but didn't because he raced better on less which does not prove that was one of that large group who couldn't hold up at 100 or more.
Also, I have no idea what percentage of the world's runners I know or knew. What per cent do you know? It's probably similar to mine. Certainly I believe there are some runners who will break down at hundred mile weeks. I just never knew any of them. Of course my sample size is small. The number of people who run 100 mile weeks is small but decades ago it was larger than now.
I believe you claimed that only a small percentage of runners are able to run 100 mile weeks without breaking down. Let's say I knew 20-25 people who ran 100 or more miles a week consistently and none who'd tried to run that much but broke down from it. Those numbers don't support the idea that only a small percentage of runners cannot handle hundred mile weeks. I should have known SOMEONE, actually I should have known several someones, who'd tried running 100 mile weeks and couldn't.
Again, it's too small a sample size to draw conclusions from but if you know 20 people who can do a thing and none who can't do that thing it's reasonable to conclude that the thing is a thing that most folks could do if they wanted to. I'd bet that if the government took 75% of the defense budget and used it to pay $2,000 a week to every adult American who ran at least 100 miles in that week regardless of pace, you'd have at least 2/3s of the population running 100 mile weeks. But tell me, how many people do you know who tried running 100 mile weeks and broke down? And I'm talking about people who spent years working on it and not someone who went 49, 66, 88, 100, and fell apart.