Never see what was wrong with the old system slightly modified.
150hrs P.1 PPL to start AFI course.
Instructor written to reflect whats actually required of an instructor.
500 hrs supervision to remove restriction, that should at least see an instructor through the first winter.
Say 25 solo supervisions of which the instructor as at least done 5 hours with student.
In 20 years of instructing under the various ways of getting the instructors ticket i've never seen any difference in standard.
Whats more important is the psychological/personal make up of the instructors i have met.
If an instructor is not doing something right then its up to the CFI to put them straight.
Perhaps the only change is the reduction in ex RAF types from WWII who were happy to throw an aircraft around having had the benefit of hundreds of hours in very powerful aircraft and well structured training.