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Actually your quote doesn't provide any insight into the nature of the power of the Three. It simply says what a bearer of one of these rings could achieve. The quote may as well say "...if they so choose." If Sauron sought these rings for the power they possessed*, it wasn't because he wanted to preserve something from the decay of time. He didn't need the durability of anything enhanced since it was all invincible anyway, as long as the One Ring was in existence. Besides, the quote doesn't say anything about a general durability enhancement, it talks about a holy power of preservation. This was the will of their maker, as well as the will of the bearers of Vilya and Nenya. The quote doesn't single those two rings out, however, so we can assume it applies to Narya as well, yet Narya was not used for that purpose. It was used to ignite hearts, which also happened to be Olorin's particular gift: this indicates that the powers of the Three were subject to the will of their bearers.
*Actually, I think it's more likely that he sought the Three just to deprive his enemies of them.
Edit: Oh, and "the point would be moot."
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