You didn't specify men's or women's side so I'll address both.
On the men's side Rupp got a silver 4 years ago and has to still be considered a medal threat, especially with what is going on with Kenyan athletics. I think he actually has a better medal chance at 10,000 than he does in the marathon. Lagat can still close in 52 in a tactical race, which the Olympic finals usually are so he could be in the mix for medals as well. Assuming Lagat makes the 5000 final both will almost certainly finish in the top 10 in their respective events. When was the last time Galen finished outside the top 10 in a 10,000? I doubt any of the other team members at 5,000 or 10,000 have a chance at a medal, but Hasan Mead or one of the Army guys might surprise and get a top 10 placing as well.
On the Women's side Huddle and Infield went 3-4 just last year in the 10,000 and Huddle is better this year. the competition may also be stronger, so the chance for a medal is probably 50/50 at best, but there were lots of years when the chances for an American medal at 10,000 were basically zero. The Women's 5,000 team might not have a legitimate medal contender with Huddle declining her spot, but I still don't think it is the weakest team ever.