The decline of manual transmissions can be attributed to several factors. Firstly, advancements in automatic transmission technology have made automatics more fuel-efficient and easier to drive, diminishing the appeal of manual transmissions. Additionally, the rise of electric vehicles and hybrid technology often favors automatic transmissions due to their seamless integration with electric powertrains. Furthermore, the widespread adoption of automatics by mainstream automakers, coupled with declining demand from consumers, has led many manufacturers to phase out manual transmission options from their lineups. Finally, the convenience of automatic transmissions in heavy traffic and urban driving environments has further contributed to the decline in demand for manual transmissions.