As Bitcoin's dominance declines to 57%, speculation about an impending altcoin season is rising. The Altcoin Season Index stands at 77, suggesting strong momentum for altcoins. However, analyst Cas Abbé warns that the monthly index may be misleading, advocating for a focus on the yearly index. Abbé points out that most altcoins have yet to reach new all-time highs, a critical marker for a true altseason. Bitcoin's dominance would need to drop below 55% for a significant altcoin surge. Despite a bullish outlook for Q4, driven by the Federal Reserve's rate cut and Bitcoin's robust September performance, analysts advise caution as the market has not fully transitioned into an altseason.