When equivalent EVs reach comparable prices to ICE cars, there are two factors that will distort what happens.
1. The tradein on your old ICE will get disappointingly low
2. As EVs replace ICE vehicles, one of the intial effects will be lowered petrol demand, and as a result, oil prices can be expected to drop. 
I think the magnitude of these effects are quite unpredictable. I am sure that they can be modelled by economists, but to do so you need to input values for a number of factors that will be pure guesses - so the results will be whatever the modeller want them to be! 
Typical for economic models, and this will be a substitution of technology that has no prior comparable examples to learn from.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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