It's possible that Bombadil is not affected by the Ring because he doesn't want anythingYou are both straying too far, but then I brought up Ents, so we are all in tooks corner today...
But as long as you bring it up, I like this interpretation.
Hey, we're discussing Bombadil, mostly - that's well within chapter limits. And I didn't start with the Ents. Other than Bombadil, and the Old Forest itself, there really isn't as much to debate in this chapter. We could talk about the character development, I suppose - Merry seems pretty self-assured, and Sam really doesn't like the trees much, I think.
Have fun at the movies!