Well it's an interesting weapon, but Russia and China aren't the only ones working or using such a torpedo.
http://64.233.169.104/search?q=cache...lnk&cd=1&gl=us
http://www.stratmag.com/issueMay-15/page02.htm
Quote:
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Scientists at the Naval Undersea Warfare Center in Newport, Rhode Island demonstrated in 1997, a fully submerged launch of a supercavitating projectile (with air injected in its nose) with a muzzle velocity of 5,082 feet (1,549 meters) per second, making it the first underwater weapon to break the sound barrier. More recently the US unveiled supercavitating bullets. That program was inspired by the menace posed by harbor mines during the Gulf War. The slow and dangerous job of disarming mines often falls to divers because bullets lose momentum and direction after traveling a few feet through water, which is thousands of times denser than air. But supercavitating bullets fired from planes or helicopters could pierce and detonate mines from a safe distance
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Couple the above with this sonar:
http://www.fas.org/irp/program/collect/lfa.htm
And you would have an effective anti-submarine deterrent force. Personally, I'd keep the very quiet submarines we have today and just use the active sonar system above to locate any threat submarines, by the time you got your 688I or Seawolf lined up for the shot on him, he wouldn't have time to react to your subsonic wire guided torpedoes. Heck, why even wait for a submarine to get on station, just use your carriers ASW aircraft to drop homing torpedos all over the enemy contact shown by the above LFAS system.
But one big problem is the noise you make after you fire your extremely noisy torpedo. Every asset of the enemy will now be bearing down on your location to destroy your very subsonic submarine after only one attack, which by the way will be a short ranged attack because of the limitations of the Shkval technology.
At any rate, it is interesting technology, but no matter how good it sounds, there will be a counter for any technology.