More Japanese carriers would still require more trained aviators

Would Japan building many more G14-type carriers significantly prolong the war?

Only if Japan also expanded and reformed pilot training; aircraft and hull numbers cannot compensate for a shortage of deployable trained aircrew.

More carriers could help Japan, but the decisive shortage was trained pilots. Japanese naval aviation had ideas and potential, yet struggled to expand training quickly enough. Additional carriers would have to be paired with institutional reform rather than treated as an isolated procurement change. A later follow-up adds that an American-style training system would need to be adapted to Japanese naval culture rather than transplanted unchanged.