Why Taranto did not create the Pearl Harbor plan

What would happen to the Pearl Harbor attack if Taranto's shallow-water torpedo attack had failed?

Little change is expected: Japan had its own plans and exercises and would not necessarily abandon them because a British attack failed.

A failed Taranto raid is judged unlikely to stop the Japanese Pearl Harbor plan. Japanese and American planners already knew of British First World War proposals against Wilhelmshaven, and all had developed ideas for striking fleets in harbor. Japanese exercises also reduced dependence on the British example. Mers-el-Kebir is identified as another attack on a fleet in port that preceded the final Japanese planning. The argument places Taranto within a longer development of harbor-attack concepts rather than treating it as the origin of Pearl Harbor.