The problem with swarms is about their inherent limitations - for example in terms of onboard energy generation for propulsion/weapons.
As to switching to unmanned UUV motherships - ethics force you to keep a man in the loop.
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Imagine if you were on a sub underwater and heard that noise as AUV's swarmed about before the kill.
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In an SSN you can always outrun those light UUVs, decoy them (remember small size = poor sensors and processing power) and so on and so forth. Under water you then get the comms problem, that is - it is hard to make a good and stealthy comm system for under water (though I guess there was decent work done on green lasers).
(those are but few out of many reasons why in addition to the small/electrically powered/slow recon UUVs we are desighning large/nuclear powered/fast UUVs)