I have an unpopular opinion, but here goes...
If you really want to go into a field that gets paid for procedures, do surgery. Not EM...not anesthesia.....surgery. Seriously. NP's and PA's are no where near capable of doing the bread & butter things that get us paid. This is true for pretty much every surgical specialty.
If legislation like this passes, I really see it applying to small office procedures (skin biopsies, IUD's, etc.) or hospital procedures that 3rd/4th year medical students get to do (central lines, bronchoscopies, thora/paracentesis, etc.) If NPs/PAs get paid just as much to do these basic procedures compared to an MD, so be it. If salary-based physician compensation continues to increase it won't matter how much we bill for these basic procedures, because the hospital gets the money anyway. Those in private practice can make more money off their PAs/NPs for doing easy procedures (as long as they assume liability).
It's preposterous to think that my skin biopsy/central line is worth more than one done by a PA/NP just because I have MD behind my name. On the other hand, I've seen Dr. Pimple Popper do worse things to people under the knife than some PAs/NPs.
Lastly, I don't think this is a slippery slope argument. PAs/NPs are nowhere near qualified to be primary proceduralists in the OR. Hospitals and procedural privilege committees will never allow it, the liability is greater than the benefits.
Hell, I'm a resident and patients still ask me if attending Dr.Whoever is the only person doing their surgery.