Yeah, Hagrid's probably a goner.
Even though I don't agree with Tim's sidekick logic (that should come as a surprise to no one), I agree that Hagrid's death is going to probably be the most sentimental gut-check for Harry. Hagrid was his first guide into the magical world. It was he who opened the door for him, almost literally. He's never wavered in his support of Harry. His death will be the final push for Harry, though admittedly, he hardly needs one.
But Hagrid's predilection for unmanageable beasts (like his brother, the full giant, Grawp) will likely get him in over his head. I don't think he's going to be killed by giants, but I do believe he will be killed trying to save Grawp and possibly the trio.