Coach Sommer said:...at what point will it no longer constitute the bulk of the conditioning.
Ahh, there's the rub.
As your book is meant to be Basic Strength... I can deduce that there is a certain ammount of strength that is measured by basic strength abilities and that level is good enough. When the next book is published, it will take us farther toward the goal of Dynamic Strength, which in and of itself is a way of realizing the "maximal strength" that we tried to lay as a foundation in the first phase. This becomes a cyclical journey that begins to see narrower progression due to a level reached that is the potential of our genetics.
Am I close? 8)