Mega-IPOs, including those of SpaceX and OpenAI, are being prepared, prompting analysts to suggest they may mark the peak of the stock boom. Some warn that if these large IPOs fail, it could have significant negative consequences for the market, with one analyst predicting a potential 40% market dip. The situation has drawn comparisons to the dot-com crash, with some expressing concerns about speculation in the market, particularly with regards to AI stocks.