Reasons GM may have killed the Volt and other cars.
1) The American public is walking away from sedans. This year sedan sales represented only 30% of the market, the bulk of the rest were trucks, crossovers, and SUVs. Sedan market share has been shrinking for a few years.
2) There is more competition. If you're paying attention to world wide electrified car sales they are growing in volume and there are new entries such as many new car manufacturers in China. Who's making the majority of electrified cars? Not GM. So GM is taking money from closing plants and targeting
BEV markets by putting new cars in the design cycle.
3) With the future (who knows when) moving into autonomous cars there will simply be less cars purchased. Those that do sell won't be of the sedan variety.
4) GM has union negotiations coming up at the end of 2019. Idling those plants gives GM powerful bargaining tools. GM has not announced selling those plants, just stopping operations for now. The mix of assembly plant workers is changing as there are more technical jobs required for BEVs and less overall part quantity for lower skilled workers.
5) Volt $7,500 tax credit is going away because government limits have been reached. Same for Tesla. It will be interesting to watch Tesla sales if the tax credits are not extended.
6) Chevy Volt sales are way down in 2018 vs 2017.
I'm interested in seeing the sales figures for the Volt and Clarity for November. It's possible the Clarity PHEV, in it's first year of production, will top Volt sales for the year. Volt sales could go up though as dealers want to dump them and drop prices.