there aren't many US distance runners outside of Bowerman Track Club, the Army Group and Oregon Project that are serious medal threats on the global scene. the best guy in each of those groups is an absolute medal threat (Chelimo, Centro, Jager, Centro, Murphy, Rupp). In that group, we have a medal contender in every event from 800 to marathon. It's been decades since that was a statement you could make.
aside from that top group, however, there isn't a whole ton of depth if you are basing it entirely on being a medal threat. robby andrews is really the only name that comes to mind as a guy who could win a medal and he was hurt all last year (and probably won't ever run 3:31 in the first place). Drew hunter might get there, but he's still so young and may be more suited to the 5k long term. guys like kyle merber, eric jenkins, craig engels, ryan hill, ben true, riley masters, pat casey, etc all have what it takes to be solid US pros but nothing more. keep in mind, running 3:31 gets you in the top 10 all time for US runners over 1500 meters. outside of centro, no one in the current crop of top US 1500 meter runners is that good. 3:35 is a pretty darn good time -- not that many white guys ran under it this year (the ingebrigtsens, chris o'hare, charlie grice, jake weightman, ryan gregson). we probably should have a few more guys running 3:33, but that's probably pushing their absolute limits.