Welcome to the Downs,
Tom-fool!
You bring up an interesting point.I never considered that before.
I think that it really depends n
who is trying to overthrow Sauron. Aragorn beat him in a "battle of wills" via palantir, so if he also has the power of the Ring at his command, he would probably have enough of it tooverthrow Sauron in a one-on-one combat.
However,
will Sauron die? I guess not. He didn't die even when the Ring was destroyed; he was just weakend to a point from which he can't return. The Ring always tries to find Sauron, so it would eventually betray Aragorn (or whoever has it). I wonder if it will even
let itself be used as weapon aginst it's master.
Suppose a maia like Gandalf or Saruman could weaken Sauron without destroying the Ring. Then they'd (no,
one of them) would take his place safely enough. But his power still exists in the Ring, so he will still have the chance to come back.
So my point is that you can kil him
temporarely.