I think the spine of the team is the crux of the issue. The centerbacks constantly making mistakes causing the team to collapse and compensate to support them really wrecks things.
We need better defence and a refreshed central midfield, no disrespect intended to Atiba.
Yeah, even the Belgium game likely ends 0-0 or maybe even a goal on the counter if Vitoria is 3 years younger and can cut out that simple long ball down the middle.
Croatia was a symptom of the lack of midfield quality, particularly when Eustaqio got hurt. He's the one player who if he had been injured, Canada might well not have squeaked into the World Cup in the 4th spot that Costa Rica achieved to get a playoff with New Zealand (who with only Chris Wood and a young LB at Empoli among the big 5 leagues probably wouldn't have been up to beating Canada anyways).
Wide positions should be fine with the young talent (Davies, Buchanan, Marshall-Rutty, Johnston, Corbeanu, Koleosho if he picks us and Jayden Nelson is a promising set) and David will improve, and a system can be built around him as the lone #9 since he works defensively and links up well. Keeper should be fine but not really a strength. The big questions are, as you say CB and CM.
Eustaqio, Kone and Miller filling 3 spots looks promising, but a 2nd CB and another CM might be difficult to find. Really need that kid at Nice, Justin Smith, who can apparently play either spot - and looked far more composed than the other guys in that U-20 tournament debacle - to make it, and then either another MLS guy or one of the kids playing in Europe to make it, or a 25-26 year old guy like Cornelius, Kennedy or Waterman to improve a ton as they hit 30, which isn't at all too old for a CB if they can keep improving.
Not a lot of margin for error, though. The 3 guys in italics have to stay healthy and keep improving, and it's no certainty that we'll find a CB and a CM of similar quality by 2026, there's not really a ton of guys (except for out wide) like the U.S have in Sands, Chris Richards and Tillman that have gotten big moves at age 22, 22, and 20 and you're thinking should be solid enough players in Big 5 leagues in 2026.
I think Davies might end up having to play somewhat central for us in 2026, like Di Maria did for Real Madrid.
Winger---------David---------Buchanan
------Davies-Eustaqio-Kone-------------
LB-----Miller---
Smith/CB---MarshallRutty/Johnston
------------------St.Clair
Feels like a more reasonable goal to me than finding both a quality CM and CB by then. We generally seem to end up with better fullbacks than CBs anyways. At least it's only a right-sided CB and not a left-sided one, which is harder to find, and a left-sided winger and not a right-sided one, which again is the easier spot to fill.