Final answer:
Blood infusion is not used as a method for fecal transplants, which are meant to restore gut microbiota through procedures like colonoscopy, endoscopy, or capsule ingestion.
Step-by-step explanation:
The method that would NOT be used as a current or possible future fecal transplant method is C. blood infusion. Fecal transplants focus on restoring the microbiota of the gut. Methods used include transplanting fecal matter through a colonoscopy, endoscopy, sigmoidoscopy, or enema, or via capsule ingestion. Blood infusion is not related to the gastrointestinal system and is not a suitable method for fecal transplantation.