BTW, in my opinion the whole "floater" thing was a red herring whose only currency was achieved due to the happenstance of a golf ball's density being only slightly greater than that of water. It was possible in the 1920's and it is certainly within easy reach in the 2000's to make a ball exactly the weight and size of the current ball but which doesn't fly as far.
That would be a disaster as far as enforcement. Any new rules that would make the Titleists in my bag illegal in 2008 or whatever would almost be required to change the size of the ball if it is going to affect anyone other than tour players and top level USGA and R&A competitions.
If it applied to my City Amateur and I decided to enter, they'd need some sort of way of determining if the balls I'm teeing up are legal or not. The best way would be with a ring to test its size, if the new balls were just a bit larger it would take two seconds to check a ball. I can't imagine any other way to do it unless all new balls were required to have a specific dimple pattern (which is another possibility the USGA could potentially consider as part of their regs) or a special mark -- though that isn't foolproof.
Any argument or suggestion that brings up the requirement of floating the ball on water is invalid on its face. Anyone babbling about the ball floating is obviously not seriously concentrating on the question at hand, to wit What is the best size and weight of a golf ball for its intended purpose of playing golf?
Well, sorry, you are too late then. The size and weight we have now isn't ideal, the British ball that was the same weight but 1.62" instead of 1.68" went further and was easier to putt into the hole than the ball we have now. I don't know what the "best" size would be, but we have the size and weight we have now because they are the minimum for size and maximum for weight per USGA and R&A rules, not any belief that they are best. Its no more ideal for golf than a football is the ideal size, shape and weight for kicking field goals. A football is the way it is because the rules say so.
But I think it is clear that something obvious and quick to check would need to change if the rules governing the ball changed. Even if the day the USGA announced the change no nonconfirming balls were made there would still be millions of new balls in stores, garages and bags, and billions of used ones in basements, shag bags, and golf courses around the world. I've probably lost Pro V1s in places that no human will venture for decades