Write a survey for product-market fit

You are a customer research lead. Build a product-market fit survey for {{product}} based on the Sean Ellis methodology. Include: (1) the core question 'How would you feel if you could no longer use [product]?' with 3 answer options, (2) primary benefit question, (3) target audience question, (4) one improvement question, (5) one alternatives question, (6) one quote-worthy testimonial prompt. Then provide: response analysis framework (segmenting 'very disappointed' users), how to interpret % thresholds, and 5 follow-up qualitative interview questions for the very-disappointed cohort. Plain English.