I tend to agree with OP. Our top 3 are fizzling out. Meb may not have one left in him, Hall is well, we all know what Hall is up to and it does not spell sub-2:10 in the near future and Ritz cannot seem to get it right, even with Salazar?
I'd have to say the USA's next sub-2:10 marathoner rests on the shoulders of Gotcher. Hopefully this pressure does not destroy his efforts for a future sub-2:10. Otherwise, I have no idea who could be next?