Nvidia Corporation (NASDAQ: NVDA) continues to lead the stock market with a year-to-date return of up to 185.8% in 2024, significantly outperforming other "Magnificent 7" tech stocks and the S&P 500. However, concerns are rising about its overvaluation and potential challenges to its dominance in the artificial intelligence (AI) sector by 2025. A New York Times opinion piece suggests that Nvidia's competitive edge could diminish in the near future, prompting some investors, including billionaires, to shift their focus toward other AI innovators such as Palantir Technologies (NYSE: PLTR), which has seen a YTD return of 161.3% and is making strides with strategic government and commercial partnerships. Additionally, short sellers are targeting AI stocks under $50, reflecting skepticism over future performance. Wall Street analysts project that Nvidia, alongside Alphabet (NASDAQ: GOOGL), will be among the top contributors to year-over-year earnings growth for the S&P 500 in the third quarter, with the five largest S&P 500 companies expected to post average earnings growth of 19%, down from 35% last year.