Yup! I know it was just a consultation, just thought, of all the problems with poor driving we see, and talk about on here, that there would be lot more pressing improvements that could potentially be made! More interaction with those outside, than gadgetry inside?
Well I heard it on radio 4 before I read the article on the BBC, they had Quentin Willson

However, the sat nav idea was 'to test the driver on their skill at completing a route without any intervention from the instructor / examiner'. I can see the idea behind it, but like you, I'm not sure it's a good idea. Quentin was more forceful in his other suggestions that learners show be shown and examined on driving in the dark, bad weather (difficult that one) and high speed routes. Not motorways obviously, but there's a lot of dual carriageways about which are very similar.
Here in France, they do have a very good idea. Unfortunately, I don't think it would transfer to the UK. After a learner has passed their test, they have to drive with a qualified driver for 1 year before driving on their own. This will allow them to drive anywhere and in any condition with someone beside them who has that experience.