At the risk of offending my American neighbours, the best way way to increase professionalism in US EMS would be to simply drop your National Standard Curriculum for FR, EMT, EMT-I and EMT-P levels and adopt our Canadian PAC National Occupational Competancy Profiles for EMR, PCP, ACP, and CCP levels.
Before anyone complains that I am wrong, I have trained in Buffalo, NY as an EMT-Basic (NYS and NREMT certified) and in both Ontario and Alberta as a Canadian EMR. Even though my EMR course was only 80 hours, I learned some things that were not covered in the US course (137 hours), such as applying a 3 lead ECG, and setting up an IV set. How many others on this forum can say that they trained in both systems?
The problem with the US EMS education system as far as I can see, is in what material is taught, and how it is taught. Many Canadian EMR courses use US EMT-Basic textbooks (my Alberta course used Mosby's The Basic EMT). Many PCP/EMT courses in Alberta use Mosby's EMT-Intermediate/99 textbook, so the problem can't be the textbook used.
The problem can't be the length of the course, either. Professional Medical Associates, in St. Albert, Alberta runs a CMA accredited PCP/EMT program that consists of only 240 hours of classroom didactic instruction. Yet even with such a short program, this program is rated as one of the best in Alberta. And it is short enough that even volunteers can take the time to take the program.