Ah, variety is the spice of life....
I simply have to disagree, the winged
Nazgul were not unleashed until they could serve as the secret
weapon against
Gondor...they were not around in any previous battle (the
Bridges of Osigilath) they were the 'a bomb' of the battle of Pelennor, but they failed
They would not have been used up patroling the borders of
Mordor from winged enemies. The
council of Elrond could certainly come up with a suitable diversion to distract
Sauron as
Frodo winged it to Mordor, if
Glorfindel could drive the riders into the river, he certainly had a bit of power, also there were two of the
elvish rings siting around the table, if
Gandalf and
Elrond had decided to reveal themselves at the right moment and try to wrestle some power from Sauron...
Frodo flies over, drops
the ring, home in Gondor for dinner
Tolkien could have done it. It just would have sucked
'foots