I agree that the size limit for moons should be 1 km. But then again, what would objects smaller than 1 km be? I think the problem is that there are probably hundreds of moons around Jupiter, and it would be ridiculous to try to find them all.
Also, I think that Cassini will boost Saturn's moon count to at least 60.
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\Cassini might not neccessarily discover new moons. Remember, all of the new moons being discovered around Jupiter are being found by the Canada-France-Hawaii telescopes atop Mauna Kea in Hawaii
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While it is true that Mauna Kea is finding new moons all the time, that doesn't mean Cassini won't find any. Remember how many moons the Voyagers found? Virtually all of our knowledge of Neptune's and Uranus's moons comes from Voyager 2, and Cassini, with better instruments, should be able to find more.