Frankly, IF I were in the market for a NEW car (and ONLY new cars), I would buy one, if only to tell the manufactures of modern cars "fuck your crossover boring bs, I want THIS."
That said, my ONE sale is unlikely to sway any marketing decisions, especially for big manufactures. I want them to sell like lemonade on a hot day, even if it does mean I see them everywhere. I'd be ok with that. Better than seeing YET another Mustang around here... I have YET to see even ONE Genesis (arguably the only competition in the mid-size sport car market that isn't a Camaro) anywhere in Wyoming. However, let's talk apples to apples here.
Apple # 1 = Miata.
Apple # 2 = FR-S.
Realistically, these are the only two cars in this class. Given the weight of the Mustang and Camaro, neither of them is going to have the handling dynamics of either of these cars. Sure, they might hold alright on a skidpad, but ONE number does NOT equal the whole car. Neither does horsepower. I used to pick on Mustangs with my 105whp 2000 Miata. Given the gearing, weight advantage, and the fact I'm not half bad at driving, I could pretty easily keep up with the GT guys. Throw some corners in the mix, and it wasn't even a contest. "Normal" spirited Miata driving would be akin to suicidal driving in a Mustang/Camaro, both then, and I suspect still now.
Now, I figure the FBRZS will handle every bit as well as the Miata, possibly even better. Don't count Mazda out though, the ND is well into the planning stages. Can the market support two cars of this nature (three if you count Subaru's version) for long? I doubt it, given how few Miatas I see anymore, and how many of SameHighun-Interestingcar Thatpeopledontwanttocallawagon (known in this acronym loving world as a SHIT) cars I see every day... We'll see.
All that said, every single one of us NEEDS this car to succeed. If it doesn't, the reasonably sized (seriously, park a Supra next to a newer "sports" car), fun to drive car will likely make way for that ugly something-or-other in your neighbor's driveway...
Edit: You may think I hate crossovers, I really don't. It's the proportions that kill me. Take a Ferarri, a Supra, a Corvette, take ANY cool looking car. Now lift said car about 8" higher than it should be, and magically, you've made a "crossover". Our grandparents (and parents) had wagons, and what was wrong with them? I'd take an old wagon (the more Griswold-y, the better) before I would EVER let a crossover into my garage. You'd have thought that one look at the Aztek would have killed that idea...