I've stayed out of this debate until now, but I had to comment once residency stats starting being brought up. I am not taking sides on this debate, but i do feel that it is important for the best information available to be presented.
Your logic is sound that DOs can get into ACGME residencies, but it does not play out. Your claim that DOs match well in ACGME programs is really not quite accurate. DOs only account for ~6% of the residency spots, less than US IMG and less than half of what non-US IMG have. For instance, taking the derm example that you have been using:
23 out of 29 that matched into Derm were Allo. Of the 6 people that matched who were not Allo, only 2 of them were Osteo. This means that the DO population of residents is 6% in Derm.
Now this might not seem so telling, but think about it in these terms:
Since 2006, the 95% of allo students match into ACGME programs. In comparison, only 70% of osteo applicants match (up from 65% in 2006). This is the basic argument that is trying to be made in this thread. If you want to match into any ACGME program, you have a greatly increased chance of doing so through an MD program as opposed to a DO program. The other major telling issue is that of the 3000 DO applicants to ACGME programs, 700 withdrew their application and more than half those that were matched went into primary care specialties (including peds, it gets closer to 2/3).
There is no doubt that DO schools are on the rise, and that at this point in the real world (as in, not on SDN) MD=DO. I am not saying that one program is better than the other, but in terms of residency options and programs, there is no doubt that the MD route is the safer bet. Although, as stated previously, if there are substantial external factors (e.g. living arrangements), choosing a DO over an MD can make sense.
As for those of who keep asking for sources, here is mine:
http://www.nrmp.org/data/resultsanddata2010.pdf
Look at tables 2, 4 and 11 and figure 2.