Crypto analyst Michael van de Poppe has suggested that Bitcoin's traditional four-year market cycle may no longer be applicable. He points to recent market trends, including the shift from 'Uptober' to 'Downtober,' the lack of simultaneous altcoin breakouts, and Bitcoin reaching a new all-time high before the 2024 halving. Van de Poppe believes these factors indicate a deviation from the expected cycle, proposing that the current cycle could extend by an additional 1.5 to 2 years.