Second, there must some set of scans that are easy. It's not hard to imagine a device that says, "yes" or "see a real radiologist". Perhaps later revisions can even say "No". an example might be a mammogram analyzer. I think even 10% getting an immediate answer would save a lot of money.
I think it's the normal progression of technology. Generally, you don't need a Phd in math or physics to program computers like was required in the 60's. The net effect will be the average case you look at is much more challenging.