i can understand your sentiment, and can sympathize with the fact that you must feel frustrated wanting to get into the specialty of your choice and wanting as many options as possible. I also think ideally in the future all residencies should be dually-accredited. However, i think it's important to get to this place in a step-wise fashion, as just opening up do residencies to md students while the do bias still exists in md residencies would just be very disastrous to do graduates.
For instance, if all do (aoa) residencies were suddenly opened to md students, we'd have md students applying disproportionately to the road and other competitive do specialities. I don't expect a great proportion of md students to be applying to the primary care do residency programs, as they would likely prefer their own acgme residency programs due to prestige/location, etc. As it currently stands, there are a greater percentage of dos (as compared to mds) going into primary care specialties. Having md students apply to already competitive do residencies would only further drive up competition for these spots, reduce the number of dos in these fields and thus further increase the gap between mds and dos in non-primary care medical practices.
Conversely, this is not the current reality when it comes to present day do students applying to md residencies, as a large proportion of do students applying to the md residency programs are applying to primary care and lesser competitive md specialties. I wish i had some actual stats here to back me up, but you can look at the yearly residency placement sheets that each school produces to see what i'm referring to. While it appears that almost 40-50% of each do graduating class enters md residencies, a large proportion of them are in primary care specialties.
In order to start somewhere, i do think it would be appropriate to start inviting md students to apply for do residencies, especially in regards to some of the primary care residencies that go unfulfilled each year. After the do scramble, those open positions should first be made available to us md students, and then if positions still remain, they should be made open to foreign medical graduates. I think this would be a first step in bridging the gap between dos and mds. With time and in step-wise progression, residencies can be made dually-accredited for all, so that do or md initials have no bearing on an individual's qualifications for residency. However, in order for this to happen without hurting dos, it would be essential for the do bias in md residencies to dissipate.
So as much as i sympathize with your frustration, i think the aoa/ama needs to work together to find solutions to this issue that can be beneficial for all, without hurting the other group. If you can find solutions that benefit mds without hurting dos, then you could probably get the needed support from both communities.