It came out this afternoon in Germany that BMW announced a bonus deal of 2,000 Euro for people with a Euro 4 diesel car or older....but you can only use this money for the purchase of a BMW electric car (the i3), a hybrid BMW or another diesel BMW with the Euro 6 standard.
There are a number of negatives to the deal....you'd have to accept this before 1 January 2018. You can't use it to buy a gas-car. I would imagine at this point....no one wants to buy into diesel cars....even a BMW-type.
I suspect that part of the long-term solution for the government is making offers like this more bold, and enticing toward the hybrids or electric cars. Maybe it'd take a 5,000 Euro German government tax credit if took the older model diesel and trashed. Some of these diesel cars that are in the 'bad-car' mix.....are from the 2005 era or prior. I would imagine some diesel cars....particularly the older Mercedes and BMW types from the early 1990s are still running today.