What notion of heroism, redemption or success/failure do you believe that Tolkien was trying to convey with Frodo's inability to complete the quest and destroy the ring. What was he trying to convey with Gollum's role at the end. To build Frodo into a tragic hero only to have him not succeed was an interesting plot point. A secondary question- What if Gollum had not been there. Do you believe Sam would have had the temerity to confront Frodo and attempt to complete the task.