Really interesting topic. One point of contention I can see is the use of average MCATs vs. efle's comparison to current median MCATs. Let's take Pittsburgh (a USNWR top 20 school) as a case study.
According to the document, Pittsburgh's average MCAT was 31.2
Looking at their website (
http://www.medadmissions.pitt.edu/our-students/), their current average MCAT is ~33
That is a 1.8 point change over 10 years, or 0.18 point change per year. This seems in line with my intuitions of MCAT score creep.
If you look at UPenn's current average MCAT (
http://www.med.upenn.edu/admissions/entering-class-profile.html) however, it is a 38, compared to a 32.1 average 10 years ago. This is a 6.1 point change, or a 0.61 point change/year.
Tl; dr: Changes in scores seem to be school specific. The highly accelerated score creep is probably focused on the ~top 10 USNWR schools. Maybe this indicates how "holistic" each school is in screening and selecting applicants.