This same topic has come up multiple times in the world of Osteopathic Medicine. MD's want us to merge with them and become MD's ourselves. Still other's, DO's themselves, would have us change our degree title to MDO.
I think it's a terrible idea, for both us, and you and here's why.
DPM's (as far as I understand) have something better to offer patients with podiatric issues. You guys really know your stuff. MD orthopods are probably a little threatened by that, hence their desire to have you merge. The exact same thing happened to DO's in the mid 20th century. MD's had spent years bashing DO's, trying to undermine our profession wherever possible. Then they decided all of the sudden that we were good enough to merge with them. When that failed they went back to bashing, and we used their willingness to have us merge to demonstrate that even they didn't see a difference. That little excercise is what finally got us into the military. In California, where many DO's did merge with MD's, all it took was $60 for the new diploma. No extra training, or "un-DO-ing" necessary.
I'd take your differences, expand and improve on them, and make a name for your profession as elite foot and ankle specialists.