I don't think anyone is saying that Final Fantasy XVII should be done in the 16 bit graphical style (though nothing would please me more) because, no, that wouldn't be marketable to the masses.

But there are those of us who would like new 16-bit style FF games made. Perhaps FF Legends can become a spin off series and release games in this vein for the iPhone or Wii ware or something. Some of us actually prefer that graphical style and gameplay style to the modern entries in the series.