I will note that the ideas I present are neither original nor new. Many of them were part of my teacher training in the 70s. The process of implementing ideas is something that needs careful understanding and planning so attempts to do many things did fail but basic concepts such as the individual student differences are understood. A student or learning-centric structure will be able to provide a more optimal education for all students while our current educational structure that is primarily for administrative convenience will run into limits. Such a structure can provide an adequate education for many but optimal for few. Unfortunately, an adequate education in the past may not be adequate in the 21st century.
Proper use of technology can make the transition possible and cost effective while largely eliminating problems like inadequate teachers and teacher shortages.