Regarding practice rights:
I'm a big proponent of the mindset in which there will always be a need for the PCP who is residency trained. I see this especially holding true with the ACA and the drive towards ACOs and PCMHs. The training we receive is superior than the midlevels, but unfortunately there hasn't been enough studies done to show if outcomes are equivalent or different. We think differently. We are able to respond to situations appropriately even if we need to walk away from the algorithm. The nursing model of care follows algorithms. Our brains will never be replaced. I do feel better about PAs since they're under the control of state medical boards so there is appropriate oversight. PAs also get much better clinical training. As far as rural America, everyone needs a PCP(rovider) regardless of degree. Despite the inherent risk of more complications by not seeing a physician, it still allows improved management and health, keeping patients on track for a healthy life. I think you'd find this thread interesting over in the Allopathic forum:
http://forums.studentdoctor.net/showthread.php?t=985512
Regarding FM docs in the ED:
I do think its going to change. I remember reading on SDN somewhere that the change was already starting to occur where hospital organizations are looking for board certified emergency physicians. I think this is a good move. An FM doc, who does no extra time in EM has an EM rotation in medical school and during intern year. That's not enough time to learn emergency medicine for truly emergent issues. If you would want to work in the ED and still do family medicine, then I'd recommend a dual residency.