Optimism over being realistic?
I hope you're joking.
Look at GM's Sky/Solstice. IIRC, I read an article somewhere saying they're having trouble unloading them now that initial demand has been filled.
So, based on that fact, how do you think a 2 seat Ford roadster would do in the long run? IMO, not too well as a consistent seller, at least not as well as a Flex could do. With Flex, you know that there's always going to be somebody who will need that vehicle a vehicle you can pile tons of stuff, people, whatever into, while still being fuel efficient and stylish (yes, I like it). With a small roadster, there's not necessarily always going to be a market for that type of vehicle, I know you're going to argue about the Miata, but that is an established, proven model that has it's own following already.