The four-year cycle theory of Bitcoin primarily revolves around its halving events, where the block reward is halved every four years, affecting supply and subsequently influencing price. However, as the market matures, institutional investors increase, and the regulatory environment changes, this cycle may be broken or weakened. In the future, Bitcoin's price may be more influenced by macroeconomic factors, market sentiment, and adoption rates, rather than solely relying on halving events. Therefore, the four-year cycle may gradually fade, and market volatility will become more complex and variable.