I do agree that the FiST will be a limited run vehicle, at least in the US. My reasoning is that our car culture sucks ass compared to other countries. I'm not saying we're the only country that likes high HP and big speed, but we focus on it more than anyone else in my experience. In the UK, for example, people drive cars with 7 second 0-60 times and call them "proper quick", but in the US we see that as "OMG SO SLOW!!!!!111!!!1".
Just look at the car comparison comments on various sites... "Why would you buy a BRZ when you can have a V6 Mustang for the same price". Our car culture doesn't care as much about chassis refinement, handling FEEL, a car's spirit, the concept of 'driver's car', etc, as we do about raw power and speed and that sucks. It sucks because in the end it's why car companies can't afford to give us long runs of unique and fun cars like The FiST, the BRZ/FR-S, etc. We just don't buy them enough on the whole because the non-enthusiast is going to go to Ford and see the fully load FiST with a $25.6k sticker and then see the comparably equipped V6 Mustang with the same $25.6 sticker, or close enough, and choose the Mustang every time because Mustang and because both can be haggled under MSRP/sticker.
We are our own worst enemy when it comes to the cars available to us. Hell, the BRZ/FR-S is the perfect example of this. Enthusiasts begged for a competent handling, fun to drive, inexpensive RWD car for years and they got it. At first it was the second coming, then after a very short time all the "it's too slow" complaints started coming and year over year the sales dropped. Yes, the sales dropped partly because of those who wanted one already having one, but they also dropped because word got out that they were "dogs" and here in 'Murica we can't drive a car that can get beaten in a sprint by a V6 Camry/Accord/Minivan!
Fun fact - when both are professionally driven the twins match the FiST in 0-60 and 1/4 times, but the FiST is never really referred to as "slow" yet that's all you ever hear about the twins.
Why? The torque feel that is lacking on the twins? Or is it because we're a lazy culture and hate the idea of working for our speed by downshifting and reving the hell out of it? Could the twins have been faster off the shelf, sure, but considering they are purpose built and not just a re-working of an existing platform that is used to recoup the cost, it would have cost a helluva lot more than $25k to buy and then you're right back in the same boat, only this time it's "why buy the BRZ at $35k when I can get an STi, or Mustang GT w/ performance pack at the same price!".
Anyway, I'm ranting and going off base on the topic here, but in the end, we want these small, unique, quirky, fun, good handling cars for $25k or less, but we don't buy them enough when we get them and we complain too much about what else should have been included in that $25k so they don't last and it sucks.