I think Sam would probably have been able to resist the Ring's power longer than any of the others, but I don't think he would have been able to make it to Mt. Doom alone. I don't think any of the others could/would have provided the kind of help and support to Sam that Sam provided to Frodo. I agree with Galadriel (movie) in that: "This task was appointed to you, and if you do not find a way, no one will." So, if Frodo had been killed, I don't believe anyone else would have been able to destroy the Ring.
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"It's impossible to have Frodo without Sam, or Sam without Frodo. They're like two halves of one heart..."
"If your hurts grieve you still and the memory of your burden is heavy, then you may pass into the West..."
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