Consider the vast number of
Very heavy lorries
Large Food delivery lorries
Medium and up delivery vans
Medium to small delivery vans
Luxury diesel cars
Need I go on.....
Whilst petrol engines have got much better..
Dumping young to middle aged diesels is I think not an option.
Also what will happen to the "diesel lake" that will thus be created ?
I am not worried by the time it may/will be implemented I will need a new vehicle anyway !