It seems like the thing that helped American auto makers "bounce back" after things went extremely south before 2010 is also their biggest Achilles heel outside of being inherently gas-based vehicles: their choice to create entire lines of cars that's profitability hinged on the interchangeability and cross-model compatible frames and parts is also the reason they can't simply "re-tool" or redesign any of their models without completely scrapping the ideas and starting from scratch.
In a sense I almost feel like if these car companies decide to do as much they may have to entirely scrap previous car models and start anew. Imagine Ford saying goodbye to the F-150 / general truck models, the Mustangs, the Explorers. Chevy and Dodge saying goodbye to the cars and trucks they are able to sell to law enforcement, military, and government.
I really can't. Maybe I'm oversimplifying things but from my outside, rookie POV it seems like these are huge reasons due to the fact that their entire manufacturing supply line is reliant on this model that's helped them all but die off in competition to foreign auto makers.
They're betting their entire North American future on light trucks and SUVs.