I'll just say this: After a few decades of watching American-born distance runners struggle on the international level, I can honestly say there may be some hope for a return to international prominence with guys like Rupp and Fernandez. I've seen other Americans run relatively great times in the past (Kennedy, Manzano, et al) but they all had some major flaws in form and/or tactical intuition that condemned them to second tier status at the international level compared to the modern African elite.
With Rupp and Fernandez, I see two guys whose running form and tactical intuition speak of not just running world class times, but actually being able of winning the races that count when it counts. I look forward to watching these two as the Worlds and Olympics approach.
It's too bad Fernandez has chosen to take the summer off. I'd like to have seen a two mile race between these two while they're both still collegians. A sub 8:00 would be a realistic potential outcome. But as someone else pointed out, the rigors of the college season always seems to take the starch out of American athletes during the summer European tour season, so Fernandez is doing the smart thing.