Manufacturers are now responsible for the ultimate disposal of all products they make - chekc your new PC boxes Karrmann and you'll see they give you contacts for disposal
GM woudl be required to offer safe disposal services for the lifetime of the cars.
Given the nasty internals of high-capacity batteries this would have HUGE legal ramifications and future costs that woudl severely impact future profits.
Also, the issue of an injury whilst servicing it in the future is another minefield !!
So it will NEVER happen unless they can get a water-tight legal document releasing them from those legal responsibilities. Given the penchant for litigation in the US I don't think they'd have a hope in hell of getting a contract that would be water-tight
"A woman without curves is like a road without bends, you might get to your destination quicker but the ride is boring as hell'