Indeed in some respects we see similarities between
Saruman and
Gollum.
Yet huge differences as well.
Saruman, never having touched
the ring, but been corrupted by the very thought of it for years, and in the end, by
Sauron directly through the
Palantir, was given his "last chance" says
Gandalf - his final opportunity - to 'remept and come down.' He chooses unwisely, though he 'seems to hesitate for a moment.'
Gollum was
much more under the sway of the direct impact of Ring itself via possession - a much greater impact impact than Saruman's purely mental obsession brought. (Even with Sauron's remaining lesser power wielded upon him through the Palantir.)
Yet Gollum did not hesitate "for a moment." He had quite a little battle. Again speaking to the 'resilience of
hobbits' of whom Gollum is kin.
But from elsewhere, we know Gollum was a bit corrupted before the ring came along for him... and the ring used that.
We also know from elsewhere the purpose for wearing the ring comes to bear, and the length of time as well.
Gollum used the ring for "power to kill" among the
Orcs... and in thievery and such among his own kin before he was excommunicated.
Bilbo onlly used the ring to "deceive" (i.e., to hide so as not to be discommodated, etc.)
Frodo, pretty mcuh the same.
Sam the same as well.
There is a vast difference beteween the backgrounds of Gollum and the other hobbits - as well as the uses of the ring.
We do not, I thinik, give these differences the "space they deserve" in evaluating Gollum's ultimate potential for 'healing'. In essence, a bit corrupt before - more completely corrupt after.
It's also said, as we recall, "A
ring of power enhances one's own internal strength." To what extent did
the One Ring actally ENHANCE not only Gollum's innate corruptness, but the 3 hobbits' own natural goodness and ability to resist its ultimate working to corrupt them in the end?
Even Gandalf knew "he would use it out of pity for the people" at the beginning, but ultimately would end up corrupted. And he had the problem of knowing he wouild use it "for its power" - something none of the hobbits ever did.
An ocean of interplay, is the Ring - a many-faceted trinket with which we can toy.