2008 Hummer HX
Hindsight is, without fail, 20/20. If the GM’s Hummer brand only followed through with the HX concept, maybe they could have gone toe to toe with the Jeep Wrangler. It was designed to be a 2-door slant-back off-roader with a V6 engine and a removable door as big as that in a Wrangler. It was supposed to be called the H4 but never got produced. It never materialized, and you can blame the $4 a gallon of gasoline price or the financial crisis of the time. The H2 and H3 Hummers did not get its off-road kit.
2015 Lexus LF-SA
Lexus revealed a high-end sub-compact car known as the LF-SA. It was supposed to be an efficient urban car with luxury offerings that is easy to park. Lexus then went in a different direction and focused more on bigger SUVs and sedans. While it would have been a great product for the brand, there is no market for a small and fun city car in the U.S. at the time.