Oh to clarify - I don't think we should (or really even could) force all fossil fuel cars off the road tomorrow, the most extreme action that's even reasonable is placing a cut off for new car sales a year or two in the future[1] - then letting those age out.
We should be working on encouraging conversion to EV when older cars age out, eventually maybe there'd be a cutoff for on-road usage, but I'd be amazed if that were any closer than 15 years out, and that's super close already.
1. Re-configuring production lines is expensive, it'd likely be environmentally wasteful to force early conversions of production lines by manufacturers - giving them a window to convert allows them to cease any R&D investment into gas only vehicles and invest more in EVs.
I was responding to the false claim in your comment, "Depending on the car, you produce as much C02 making the car as running it for a lifetime."
I doubt there's a single ICE car on the market that creates as much CO2 to make as it does to run.
The additional CO2 for making an EV is on the order of 5-10x lower than the CO2 it can save (when running on renewable power). Even making a new EV on the order of operating an existing ICE car for ~50k-ish miles.
We should be working on encouraging conversion to EV when older cars age out, eventually maybe there'd be a cutoff for on-road usage, but I'd be amazed if that were any closer than 15 years out, and that's super close already.
1. Re-configuring production lines is expensive, it'd likely be environmentally wasteful to force early conversions of production lines by manufacturers - giving them a window to convert allows them to cease any R&D investment into gas only vehicles and invest more in EVs.