"AI will write good code because it is economically advantageous to do so. Per our definition of good code, good code is easy to understand and modify from the reduced complexity."

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This doesn't necessarily follow. Yes, there might be economic pressure for AI to produce "good" code, but that doesn't necessarily mean efforts to make this so will succeed. LLM's might never become proficient at producing "good" code for the same reasons that LLM's perform poorly when trained on their own output. A heuristic prediction of what "good" code for a given solution looks like is likely always going to be less "good" than code produced by skilled and deliberate human design.

Just as there is a place for fast and dirty human code, there will be a place for slop code. Likely the same sort of place. However, we may still need humans to produce "good" code that AI can be trained on as well as for solutions that actually need to be "good". AI might not be able to do that for us anytime soon, no matter what the economic imperatives are.