A hardtop coupe could sell. As far as taking away Mustang Sales, I don't think it would happen. A Fusion Coupe would be a real four passenger vehicle. A Mustang is a two person car with a vestigal back seat. If you go back to the 60's many cars were offered as Hardtop Coupes, Four Door Sedans, and even convertibles. The issue is choice. Not everyone is enamored with a sedan. Chysler tried it with the Charger, and it has been lackluster. I saw the Accord Coupe on a TV ad and thought the Japanese see the future (which is really just our past, but we forgot how to do it).