How exactly do you propose to turn this particular clock back? It's surely simply the market in operation.
I don't think that you can lump all diving instruction into one pile. I will agree that there are those who feel that minimal, cheaper and faster makes the most money. These groups (along with the certification agencies that promote this training philosophy) are the most financially successful.
On the other-hand, there are other instructors who teach through other training agencies that do not see financial return as the key motivator. Some focus on the level of diver competence and design their program to be more inclusive.
Today's Society seems to gravitate towards the quick and easy, so the majority of the people seem to go in this direction. This is not to say that there is not a market for more inclusive training. Although the way I teach has evolved over time, many of the same skill-sets I taught divers 38 years ago, I teach today. I do this not because I'm a creature of habit, but that I truthfully believe that these skill-sets better prepare the diver for the diving environment and the real hazards that they may be confronted with.
There are diving certification agencies like LA County, SEI and CMAS that have more inclusive training philosophies. Although they don't turn large numbers, they remain "in business." They seek to maintain a higher level of training/exposure time than is otherwise commonplace. They have been operating successfully for many years.
There will continue to be instructors who teach without remuneration; participating in diving instruction solely because they enjoy it. The course I'm currently training is 50 hours and costs around $200 inclusive, which is about twice as long and half the price of the program offered by the local dive shop.
I suppose what I'm saying, is that there often is an alternative to the quick, easy format used by the majority of the diving training providers. People just have to realize that they often have a choice.