Of course the poll is not prefect or the best way to look at the bigger pool of potential buyers, but still better than making up numbers out of thin air. The Corvette does just fine; when it comes to the whole 2 seater vs 2+2...
I don't think the lose of backseats are that a big of a deal. When polled, only about 10% said they would not buy if it were a 2 seater.
https://www.supramkv.com/threads/it-looks-like-it-will-be-a-2-seater-new-spy-shots-from-autoweek.717/
However, the manual part seems to be the bigger issue...
Yeah remember when I said they would do that, and no one believed me? Just here to collect my internet points. :p
https://www.supramkv.com/threads/toyota-supra-finally-spied-testing-stateside.618/page-2