Concentrated earnings growth and robust AI spending have Patrick Mueller saying "it's only a matter of time" before a rug pull tied to missed AI expectations occurs in the stock market. Recent fragility on AI ROI and ballooning debt concerns seen in companies like CoreWeave (CRWV) have him taking a step out of the AI trade. However, he finds investment opportunities in oil refiners and even the AI buildout through the Smart Grid ETF (GRID).