I have been doing a good deal of physiological research and playing around with this idea for quite some time, and I think if one went about it wisely it would be a great way to develop runners across a wide range of distances. While their methods were very different, Igloi and van Aaken both seemed to be interested in promoting efficiency and enhancing/stressing aerobic and anaerobic systems without going into long periods of oxygen debt (therefore maximizing oxidative capacity while minizing mitochondrial damage). I also have read a good deal of research that suggests that recovery can occur very rapidly from anaerobic exercise IF the work is SOLELY concentric OR SORELY eccentric... even if done on alternating days. I also feel that this plan would minimize overtraining and hormonal imbalances.
High-volume, very low intensity training, potentially split up into multiple runs, with occasional very long singles.
Very frequent (almost daily) purely anaerobic work of short duration and low volume at maximal efforts alternating between concentric focus and eccentric focus.
Concentric Days: Overspeed, downhill maximal sprint reps focusing on turnover coupled with dynamic flexibility exercises.
Concentric Days: Very short, very hard sprints up steep banks and stairs with FULL PASSIVE, recovery coupled with uphill bounding, high knees, etc. potentially including with concentric-focused resistance exercises.