This is the big question , the future values of petrol /diesel cars . How are we going to change over to electric if we can't sell our present cars ?
You'll be able to sell them all right, you just won't get much for them. Maybe it's the pub I drink in, but as far as I can see the trendy middle classes are already turning their backs on ICE cars. I've had 3 or 4 conversations with people over the last couple of weeks, and all have been along the lines of "I shan't buy another car until I get an EV".
There will of course be loads of ICE cars around for decades to come, but I reckon that by 2025 the majority of new cars sold will be BEVs or Hybrids and by 2030 most major manufacturers will have dropped ICE vehicles from their range.