Just as in the car industry, if the notion of sure-thing profit exists in the world of general aviation, its in high-dollar airframes, not entry level two-place designs. Thats one reason why new trainer production came to a standstill during the 1980s and 1990s and why the volume in this market continues to be low.
This is a companion discussion topic for the original entry at https://www.avweb.com/features/piper-tomahawk