As I post every few months... it might be worth looking at the number of schools actually set to open in the near future and that have opened recently.
2-3 DO schools are expected to open in the next 2 years (TouroCOM Middletown, WisconsinCOM possibly a NewMexicoCOM)
11-14 MD schools will open in the next 2 years (Mayo AZ, UCMerced, UCRiverside, Northern California CoM, Frank Netter School @ Quinnipiac*, Central Michigan CoM, Western Michigan @ Kalamazoo, Oklahoma U @ Tulsa, Temple @ Pittsburgh**, King College VA, UNTHSC MD School. Along with UTexas, UHouston, and Palm Beach FL as schools that may be done in the next 2 years or longer)
Its not like its been a bad last 3 years for MD schools either. 6 DO schools opened since 2010 and 5 MD schools opened in that same time frame.
There is *NOT* a difference in ease of accreditation. The people who say that are not lying, they are not wrong (well.. they might be), but they are mis-characterizing the difference. The reason for the difference in the early 2000's in growth is two fold. 1) The AAMC was strictly against expansion of schools for a long time and only had a blueprint for expansion created a few years ago, maybe 5 or 6. The AOA was for expansion from the late 90's and have benefited from it. 2) Both AOA and ACGME have research requirements, but the ACGME requirements are tougher. As such, they require schools that have pre-existing large research departments to be able to have the required research capacity off of the bat. This then becomes a monetary/resource issue as research does bring in grant money, and many schools became held up in the debate over how to divide grant money and facility usage between the medical school and the sponsoring school. The AOA has a much more lax requirement, which allows for schools without much research to get a school (As the medical school would be expected to create enough research in-house to fulfill the requirements) and if the school is self-sufficient of the mother institution for research it can proceed forward claiming 100% of the grant money without much grumbling from he sponsoring school. Point #1 is concrete and provable. Point #2 is the common gossip among school deans and others who would know more than me on that matter.
*God I love the name of this school
** Temple is in Philly. So this is extra funny for me