[lathspell]

I see your point, the phantom.

But I still do not agree that Sauron would eventually win. Sauron would be overthrown at the top of his power by the one wielding the Ring.
Of course Sauron wouldn't die, but he would be small again. And while the one wielding the Ring, should sit on his throne, I don't think Sauron would grow great enough to overthrow him again. He would need the Ring for that, and that is the one thing the other has got.
I think you can see it like this: Sauron would definitely not be dead, but he would be something like a lifetime cripple.

The Ring, and only the Ring, would be the winner if it wasn't destroyed.