GM has millions of customers to satisfy every year, and those customers are voting for pickup trucks and family size SUV's - not for a token EV. The shareholders, the UAW and the gov't are on board with this trend, too, because their revenues are derived from GM profits today not from a vague "electrified future".
Like I said somewhere else, if the subsidies and other blatantly market-distorting incentives were removed, we'd only have Tesla and a bunch of specialty/boutique EV manufacturers, and they would gradually perfect the tech, with a little help from here and there, until every Bumpkin, Yokel and Co (including GM) can replicate it.
Natural competition and purpose-driven investments into R&D will drive the progress a lot harder than the legislative meddling in the creation of the new generation powertrain.