OK, here goes: (since we can't use the "would have ended the book" defense.)
Sauron would probably have had defenses that would have forbidden Gwaihir and his folk from entering his realm. Like "Eagle Zappers" or something.
But when the ring was destroyed and Sauron was cast down then all his defenses would have failed, making it (relatively) safe for the eagles to swoop in and rescue Frodo and Sam.
That's my story, and I'm stickin' to it.
BTW - What IS the airspeed velocity of an unladen eagle?
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