I love the idea that sandworms just make a beeline and nom anything and everything that makes the slightest bit of noise, regardless of size, and spend all their time doing it
Once they're fully grown their digestive system resembles a nuclear reactor more than a stomach and they eat literally anything and can get energy out it. Even sand.
I assume they get most of their nutrition from filtering stuff out of the sand, like baleen whales scooping krill out of the ocean, and humans are just their favorite treats. They can’t get enough of those delicious, delicious people, and who can blame them?
i think the best part would be that you'd get to use an awesome curse:
"Here's the way of it: 'Burning be on you, Atreides! You shall have no souls, nor spirits, nor bodies, nor shades nor magic nor bones, nor hair nor utterance nor words. You shall have no grave, nor house nor hole nor tomb. You shall have no garden, nor tree nor bush. You shall have no water, nor bread nor light nor fire. You shall have no children, nor family nor heirs nor tribe. You shall have no head, nor arms nor legs nor gait nor seed. You shall have no seats on any planet. Your souls shall not be permitted to come up from the depths, and they shall never be among those permitted to live upon the earth. On no day shall you behold Shai-Hulud, but you shall be bound and fettered in the nethermost abomination and your souls shall never enter into the glorious light for ever and ever.' That's the way of the curse, My Lady."