[Belegorn]

I think maybe things would have gone differently had he not made the Ring as far as his plans go. The Rings were meant to control the free people and they would be his slaves. I think in Morgoth's Ring Sauron would rather have slaves than destroy all his enemies. I do not know how he would go about enslaving all the other people. With the Rings enslavement only had limited success since the Dwarves were immune to that sort of thing and the Elves were able to sense their danger before it happened. Only the Men got ensnared. I think also he might have become less powerful with continued effort to dominate the people he became a tyrant over so maybe his sphere of influence grows less over the years. I think the Ring might have given him an endless reservior so that he did not have too much worry about wasting away his power like Melkor did.

How much did the Ring help in his influence over the people of Númenor aside from their own eagerness for immortality? When Sauron wore the Ring Tolkien says that he is actually more powerful, but even so he lost to the Last Alliance and was defeated in combat by Gil-galad and Elendil. He also could not even get his army to fight the Númenóreans when they were still plentiful as a people. So he would be wielding less power in the 2nd Age to some degree against his enemies.

There is the 3rd Age where he almost topples M-E anyway without the One. His enemies have grown weak through infighting, and skirmishes with men out of the east and south for a long time and he likewise had the Witch-king overthrow the North Kingdom. I'd think then that if he was still able to get Númenor toppled then he would probably just wear his enemies out over a long period of time, if not then he'd be done. Also I'd have to think about the Istari. Would Saruman have tried to become a tyrant himself, or would have have remained true to his mission? Apparently Saruman turned aside from his mission because he was in haste to get things done. Obviously he and Gandalf would not be expected to duel it out with Sauron anyway since they were to bring the people together to fight against a common foe.