That isn't going to happen and I don't believe that it has ever been the case anyway.
I agree with this, but again nothing is going to change. When I took my test in 1963 we had cars that didn't accelerate, steer or stop properly, and both breakdowns and the need to fix them during most journeys occurred routinely, forcing people to have an understanding of the physics involved and how vehicles actually work. These factors should have made us better drivers, but we're not going to go back to the days of terrible cars. As for knowledge of the highway code and motoring law, there has always been some knowledge required for the test and both the highway code and the myriad of laws are all based on common sense anyway - for example, we don't need to know the intricacies of the drink-drive laws, we just need to know that drinking and driving don't mix.
Again, back in ancient history, most of us had a pedal bike at first, followed by a moped, then either a motorbike or a scooter, then a motorbike with a sidecar for the wife and kids, and a small percentage might end up with enough money to buy a car. This natural progression made people more aware of the other road users, but that's all in the past too now.
As with almost everything else in life, the vast majority of people are sensible, law-abiding and reasonably competent, and most of the offences are caused by the small minority who don't think that the laws apply to them. What's needed IMO is firstly much better enforcement, the police have all the tools and technology they need to catch uninsured and unlicensed drivers, but nothing much seems to be done. And secondly, the Courts don't seem to take driving offences very seriously. As an example, in the past someone caught driving whilst disqualified could be expected to go to prison, but even multiple repeat offenders are now rarely jailed.