There are millions of instamatics and other 126 cameras, but I suspect a large percentage of them are now in landfills. If Ferrania chooses to make 126 film, I might buy and shoot 2 or 3 rolls for nostalgic purposes, but doubt that I would buy more than that. I suspect that would be the plan for many others also.
If APS film were available, I would purchase several rolls every year for my tiny Canon ELPH camera. The magnetic layer could be excluded since the information it stores would be useless to home developers and is ignored by most processors currently processing this film.
I doubt there is really much of a market for either, and Ferrania's efforts would be better focused on unusual roll films such as 127, 620, and 116.