How is that different than walking into an LDS and signing up for the next OW course. The new student knows ABSOLUTELY NOTHING about the sport and even less about the instructor.
They threw caution to the wind the moment they decided to get involved with this sport.
Over in New Divers there's a thread that questions whether a person could learn to dive by watching movies. The consensus in NO! But it's probably wrong, in a way.
Anybody who can read "The New Science Of Skin Diving" and do the exercises is quite capable of becoming a diver without an instructor. Similarly with the BSAC manual. All the material is laid out, all the requirements are specified. Sure, it will be a little more risky (maybe) but with time and effort, a person could become at least as good as what an instructor kicks out with a couple of pool sessions and 4 OW dives. The DIY program would take longer but given a strong interest, it should be quite possible. Air fills aside...
As to whether other agencies follow PADI's lead? Of course they will. They already chased them down the minimal training rathole. Why not eLearning? PADI leads the way, right or wrong!
Maybe it all works out and things go back to the way people think they remember them. But things change. For millions of years the dinosaurs ruled the earth. Now we put them in our gas tanks.
Once Internet sales became a reality, the dinosaurs were doomed. Now, if they would just die quietly.
Richard