I've always believed that Americans only relate to two distance races: the mile and the marathon.
That's where the money and exposure are. I also think that you can build heros and heroines with these events. Almost everyone remembers being forced to run a timed mile in gym class hence, they have some reference to how fast a sub 4:00 effort is. (Especially if they only managed 8-10 minutes and it hurt.)
The marathon is very closely tied to Olympic lore and most people are aware of a big one in Boston. Some have even heard of one in New York.
The 5 / 10K is seen as a fun run distance in the U.S.A. That's not a knock on track guys because WE all know the demands of the two events. Geb has benefitted because of his popularity (and heavier media exposure for track) in Europe and Asia. You are right in your opinion about getting involved with a group. Kennedy made a quantum leap in his performance once he started to train with Kim MacDonald's stable of African athletes. That is something Goucher, Williams, and others have failed to do. Their "lone wolf" regimens have led to disappointing results.
I think Torres, McArdle, and Ritz can lead an American renaissance in the marathon. I just hope they don't fritter away their best years (24-30) chasing relatively mediocre track times like our current generation.