Why blockade alone would not quickly end the Pacific War

Could the Allies avoid invasion and atomic bombing by blockading Japan into surrender?

A blockade would not produce a quick decision. It would take years and still might not achieve the desired political result.

A blockade could further isolate Japan, but it would not offer a rapid or assured end to the war. Years of continued operations would impose immense suffering, consume Allied resources, and leave surrender uncertain. Maritime strangulation was neither a bloodless nor an immediate policy alternative.