Will U.S economy, S&P 500 collapse if AI gold rush stops?

Seven companies, including Amazon, Microsoft and Alphabet, the parent company of Google, now make up well over a third of the value of the S&P 500 index. Just one of the so-called Magnificent Seven, Nvidia, which makes the chips that power many of the most advanced large language models, recently, though briefly, topped $5 trillion in market value.