I'm a 4th mature medical student and think this could be extremely viable.
We had 2 pre clinical years with only patient volunteers brought in occasionally and GP placements. The time the knowledge really sticks in an applicable way is when it is illustrated by seeing real patients and performing practical tasks (obv not neurosurgery in the first week or anything).
Many very senior clinicians have described medical training to me as an apprentice and I think it is. A solid theoretical knowledge is important but I think it is possible and more efficient to consolidate that early with practical exposure.
Things like physical examinations are not that hard to remember the steps of. They stick in the memory a lot better when you actually come across a positive sign of something. I'm sure nobody is expecting new apprentices to diagnose or rule out obscure conditions from a simple examination with no oversight however they will have a lot more value than those rote learnt before exams by bored students with no practical frame of reference.
What I don't see evidence of is kids hothoused into stellar A level results by ambitious parents being the best or only realistic candidates for the profession.
Entry requirements will need to be rigorous but there is too much inequality at play in traditional entry (indeed graduate entry has become a second chance saloon for those that don't quite make the grade first time which was not its original planned purpose- it was more for those retraining and bringing transferable skills).
Hopefully apprenticeships will allow capable would-be doctors from a range of backgrounds to pick up all the knowledge needed with an emphasis on the practical.
I have faith in this as a concept. Of course it will need trial and refinement.
Point is, you need depth and breadth of knowledge to understand how illness happens and is treated, at all levels- e.g. cellular, patient, population, pharmaceutical. Exposure and experience of real cases makes this easier to absorb. I think it is fine if this learning happens in a slightly different order to the traditional.
There is a lot of gate keeping in medicine from those who have come up the hard way. The knowledge base is not that hard to understand for a bright candidate with suitable aptitude and application, it is just BIG.
Same with engineering and yet apprentices make the highest levels. Why be so against this in principle?