I myself am an Osteopathic physician and would like to throw my two cents in here. I feel most of the difference between DO's and MD's is of historical interest only. The two schools had valid distinctions back when they were the only two survivors of the Flexner Report, but one must remember that this was before WWII, so before antiobiotics, anesthesia, modern surgical techniques, transplants, cancer chemotherapy, heart\lung bypass machines, flexible endoscopy, etc., etc. Both disciplines adopted all these modalities as they became available, so the differences between them have become less and less.
I believe the only barrier between consolidation at this point is political, and that it will eventually happen.
By the way, when I was going through my ostepathic medical training, we were putting in more hours than my MD school colleagues; I know because my cousin and I compared notes and he was going to an MD school. We were taught the OMT stuff on TOP of the regular medical curriculum, not INSTEAD of.