Alternatively view it this way: The world just became completely level. There is no "DO" bias. But don't jump to conclusions and call me idealistic. Please view it this way.
Everything counts in an application. Just like in med school, a similar candidate from Harvard and Rolling River Community College will be viewed VERY differently. Not a little differently.... very. Hell, even a similar candidate from a small no-name liberal arts college and some county catch basin public college would be looked at very differently. Now apply it to residency. You are looking at people and *where* they come from matters a lot, so school matters a lot. By making all residencies equally qualified you make a de facto precendent that the training is equivalent between the two (not that each residency is equally educational, only that every single person can pass the same minimum threshold). This means that *quite* quickly DO school affiliation stops mattering. It doesn't change that nearly every DO school will fall below nearly every MD school in the US when you evaluate their value on an application, but it does firmly cement the caribbean ones below the DO ones when you do that.
Leveling the playing field means you earn what you earn. Does that mean people will lose out on some stuff? sure. But someone like myself, who likes the challenge, I like to know that in the "big picture" this does TONS for the credibility of DOs within medical education and I don't think having a level playing field is a terrible thing. It was unfairly good to us for a long time. Going to "fair" is never a bad thing unless youre being selfish (which youre allowed to do)