But they would be outdated, right?
Would an agent that can only code in COBOL would be as useful today?
Outdated compared to what? In your counterfactual, VC funded agents don't exist anymore, no?
Your argument, if I understand it correctly, is that they might somehow go away entirely when VC funding dries up, when more realistically they'll probably at most become twice as expensive or regress half a year in performance.
Outdated compared to reality / humans, their knowledge cutoff is a year further behind every year they don't get updates. Humans continuously expands their knowledge, the models needs to keep up with that.