Weeding out should never be the goal of anyone in a educational or training role. All the professions you mentioned above have substantial clinical aspects to them after their formal didactic period. EMS does not, hence the importance of the being a basic and getting some experience. It's not perfect, and in reality, the clinical/field/whatever should be changed but since so much of EMS is subject to what market forces will allow, things get abbreviated. It should also be kept in mind that the EMS level with the exception of basic are all really designed to build on former training and experience.
I can't see someone skipping union apprentice and jumping straight to journeyman.
Allow me to rephrase slightly
Me said:...if the clinical/internship/testing process isn't effectively training candidates to be medics, perhaps the clinical/internship/testing process should be fixed.
Doesn't change my point a bit, but should be more palatable to those of you who believe that "Weeding out should never be the goal of anyone in a educational or training role"(another concept that I pretty much disagree with, btw. But that's a discussion for another time and place).