Watching the U-17s play pretty miserably against Columbia (who clearly looked desperate to advance vs US knowing they were through) made me think that I don't know that I see the next WC cycle being any less bumpy than this time around.
The U-23s failed (again) to make the Olympics. The U-20s didn't exactly light the world on fire their last WC. The U-17s have a few nice players but.... I just don't see the cavalry coming on the immediate horizon to fill a lot of glaring holes in our roster, especially from a depth standpoint. Certainly in a couple years you could have guys like McKennie, Gaines, Gooch, Hyndman, CCV making the jump. Maybe some of the U-17s really come along in the early years of their pro careers: Sargent, Gloster, Durkin, Akinola, Carelton, Sands are all making an impact with pro teams (except Sargent, who is about to go to Germany).
I think there's so many question marks of guys that aren't just coming in to provide depth, but guys that have to be quality contributors to get us there. Here's my list of regulars in the current US roster you might actually want back that aren't over 30 when we would likely play our first meaningful WC qualifying match in two years (off the top of my head, don't shoot me if I miss someone obvious):
Pulisic
Acosta
Yedlin
Wood
Arriola
Morris
Nagbe