Steve I have read your work quite a bit and I don't see how we disagree. You have to look at many things when implementing a system of training. One is to consider the system the athlete is in(hs, NCAA etc). Only a very small percentage of the population is going to devote ten years to training.
It certainly would be great to sit down and map out a ten year program from 16-26 since we know that those are the years of biggest improvement. If I were to have that luxury, the two things I would most stress would be aerobic development and running economy at race pace.
The training plan also depends on the events the athlete is competing in. It seems that a 5 and 10k runner would put in more volume than a 800/1500 meter runner who needs a little more emphasis on speed/power. You used John Walker as an example, but even John had to modify his approach when beset by calf injuries (compartment syndrome maybe?). He kept his quality fairly high while managing his volume a bit differently.