Not the economy to catch up, the infrastructure needs to change.

Guv'ment needs to hold a rifle to the oil companies heads and say start selling suplher free diesel NOW.

Then you'll see an influx of modern diesels used in Europe. Hell I would see my CSVT in a blink of an eye if I could buy a 320d or 330d.

Then start moving towards methane based engines or something like that, anyway.