agree with above post. someone going into the profession now can't plan on anything except a job when they get out.
most of us working solo were former medics, er rn's, or rt's who have taken additional critical care, trauma, difficult airway, burn management, and peds em coursework. I have 2 postgrad educational credentials in em(one is from a post pa school masters fellowship in em and 1 a postmasters certificate in adv. clinical studies in family and em that took an additional yr so all told I have almost a decade of post high school education to do my current job).
we do need to get credentialed for individual adv. procedures by the hospital before working alone. at my current solo gig we all had to work with one of the docs for a few yrs on day shift before working alone. all of our charts are reviewed by the day doc within 24 hrs.
many of the pa's going into critical care today are doing a postgrad residency. these are becoming more common and I wouldn't be at all surprised if they were required for practice in any specialty field 10 yrs from now.
see this link for pa residencies:
http://www.appap.org/prog_specialty.html
in these residencies pa's typically train alongside md residents with the same requirements and responsibilities(call, procedure logs, rounding, conferences, off service rotations, etc).