Well, I think besides the warning from gandalf: (Something like) Lands change and there are many beasts unknown...blah blah saying stuff can make it come back. In a more specific example, Deagol found it after so many years under some mud in the Anduin. Whop knows? Pearl divers from Lindon?
But in any case, I think the Wise would rather know where its going and how they could get it back if they needed to. If it was thrown in the middle of the Sea, it would take forver to get it back. Considor: With modern technology, it might take months or even years to find a sunken pirate ship. Without that technology or size.....it would be completley thwoing the Ring away, moreso than Boromir and Corrupted Co. would say than sending it to Mordor with a halfling.
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