"What comes after vibe coding" is a different question to the one you're answering. Feels like your answer is about better vibe coding: I'm using a tiered document system. It's just docs all the way down. Seems to be working for me, ask in another ten years.
What comes after vibe coding? At some point the AI will be asking humans if its new software saves us time and whether we'd pay money for it. Until then, there'll be some level of humans-asking-AI to solve a problem, probably with coarser and less detailed spec at each step.