This isn't about 'cars', it's about oil demand, which the IEA forecasts to grow at about 1/2 million barrels per year to about 2040.  Demand for oil to power passenger cars, for example, may drop, other sectors will offset this fall.   To quote the EIA, "“The difficulty of finding alternatives to oil in  freight, aviation and petrochemicals means that, up to 2040, the growth in these three sectors alone is greater than the growth in global oil demand,” the IEA said in its annual World Energy Outlook."

Infrastructure requires forecasting, with risk and reliance on whatever data can be fed into its models. If we took a 'do nothing' approach nobody would build anything ever.  Why has the USA built > 10,000 miles of pipe since 2008? They are ramping up their LNG industry.  They are ramping up oil exports. Why? Demand... for the long term, that's why.

EV's make little sense if the electricity to power them comes from coal.  We are simply moving the GHG problem around, not fixing it.