I'm sorry to agree with the doomsayers but this really is the thin edge of the wedge.
Things are getting worse and worse over here for old diesels (
http://www.peachparts.com/shopforum/diesel-discussion/330540-how-much-longer-will-they-let-us-drive-our-old-diesels.html)...
...I think it is only a matter of time before things change the world over.
It might not seem like it but I do actually applaud real attempts made for cleaner air (such as technological improvements) - BUT - I don't think the way in which governments are doing this is good. There is no point - what so ever - in increasing waste. Pollution "happens" in many different ways - just banning older vehicles is stupid - because you have to create so much waste and use so much energy to replace them.
I don't think the current hybrid / battery powered vehicles are going to work out on the final balance sheet as being "greener" especially when battery packs need to be replaced within a decade of use - for some vehicles more than half of the vehicle needs to be replaced within ten years! Madness!