My ankle is shredded and I have a tiny scrape on each elbow, but other than that, the only real abrasion is on my hip, right where the base layer ended. Yes, some kind base layer there would have been nice... maybe they just need to make double-layer shorts. It's not thickness that matters, but just having two layers to slide against each other instead of your skin.
It's been my experience that my arms rarely get much or any abrasions, which is why the "why don't you shave your arms too" people are so stupid whenever shaving comes up.
Get better! But I am with hurly.girl on this, I have gone down 2 times in races both scraped my arm plenty, the first was almost just my arm.
Poor lead out guy
all you can do it keep pedaling and stay straight and hope that doesn't happen. The same situation (being close in following a guy at speed and he swerves last second) happens to me all the time but it just leads to me taking a pothole at speed not a guy on a bike.
Also for the informal poll that seems to be occurring I am on the base layers are more hot in humidity. I would think the pro base layer users would be sporting the full length vs armless otherwise.