Something to keep in mind is that BEVs become cost competitive with gas cars, at about $100/kwh. Unsubsidized. The industry was down to $137/kWh in 2020 with some OEMs already below $100/kWh. Forecasts say they'll be down to $101/kWh by 2023 across the sector:
https://about.bnef.com/blog/battery-...ts-at-137-kwh/
So by about 2025-2026, I think we should be able to walk into a dealership and have a plethora of BEV models on sale that are at or close to parity (within 15%) with similar gas models.
This is why GM is moving now. I fully expect their plans to accelerate as their tech, battery supply and manufacturing processes improve. Ditto for other OEMs. By 2030, new cars with tailpipes will be for the poors in the developing world.