As much as I'd like to see Hall go 2:05 (or faster), I think it's smart to come back to the track for a while, get some of the credentials of the other great marathoners in the world, and then move up. Just as you have to have a summer base for the V02 max work in the fall and spring, I think it's equally important to have the pure aerobic endurance of the marathon to excel on the tack. Cycling the track and marathon work for a few years will give a very well rounded athlete with very little weaknesses.
Of course I don't want to sound like a know-it-all, but I was fairly certain this was always the way to go. It's like Lydiard training to the fullest. He wanted people to work on their base not ONLY for the 12-24 weeks allotted, but for as long as possible, and that's essentially what Ritz did. I've tailored my training to accommodate this on a much smaller time scale and it's worked well for me too so far.
This is pretty much going to revolutionize training across the country in my opinion, and if it doesn't then people need to start opening their eyes a little more.