It seemed to me that the decsription:
Quote:
"...for those who had them in their keeping could ward off the decays of time and postpone the weariness of the world"
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from the Silm. clearly describes the ring's power, and mabye some of the nature of the ring makers (hence their intentions), but not the wielder.
It also seems to me that Sauron could greatly benefit from the use of those attributes. Wielding one (or more) of the Elvish rings would (IMO) enhance the durability, or resilience of what was wrought by him when he wore his Ring. If he had one of the three, he might also discover who was again wielding the other two.
IMO, if Sauron was able to regain the one ring, the point would be moot (

). No need for the three.