This is a very nice concept for preparing for a doctor's visit, way better than the multiple pages of dry medical history we are given to fill in now. It would support decision-making as a precursor though - this is not a complete tool. Nice cards would be nice, also an associated web/mobile application so that each person can enter their information directly into the system and there will be no need for additional typing. An application would allow patients and other doctors to revisit the goals and refine them later.
The decision making part is more complex and highly individualized by disease. For each disease, condition, goal what are the options: do nothing, medication, surgery, other therapy. What is the success rate for each, what evidence-based data exists, what do people say about it after the fact (balancing both positive and negative), etc.