@WilliamsSW it was more the Mustang. GM wanted to position the new 1965 model as a fun, sporty, affordable car for young people, with a longer, sexier body available only as hardtops and convertibles, but the Mustang launched a few months earlier and just completely dominated the market, with over 500,000 sales the first year, over 40% better than the Corvair's best ever year, and was way cheaper to build. By late 1965, GM made the decision to severely cut Corvair advertising and promotional spending, suspended work on a 3rd generation, and focused resources on getting a more suitable Mustang competitor out, which resulted in the Camaro. Once the Camaro was out, GM stopped all marketing whatsoever and froze all R&D spending beyond the bare minimum to remain in compliance with safety & emissions rules, as long as the cost was minimal, then ran it out through 1969. They probably would have killed it after 1966 or '67, but kept it going a few years longer mainly out of spite RE Nader. The Chevy II replaced the Corvair in it's original role as an entry level economy car, when the Falcon showed itself to be what buyers in that segment really wanted, then the Camaro replaced it in it's new role, once the Mustang established what people truly wanted, and there was no room left.
