Destroyers and light cruisers are particularly poor (and dangerous) targets for subs. And the US didn't have all that many subs early on. But the US could have begun crippling the Japanese merchant fleet sooner, had they had properly working torps. Wouldn't have affected Guadalcanal much, but it would have been felt in other areas and it would have lessened the Allied losses in the war. But shortened the war? I don't think so.
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If you find yourself in a fair fight you didn't plan your mission properly!
Those who beat their swords into plowshares will plow for those who don't.
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