this site really does need a like button.
After talking to the tech at he dealer, and from my own knowledge I have 3 theories about our 2015's:
1) Vw knew that the excrement was bound to hit the ventilator, so when the did the EA288 re-design, they made the cars perfectly emissions compliant, and the EPA is simply using the stop sale as leverage to motivate a fix for the previous generation.
2) The EA288 engine simply needs more aggressive urea injection via a ECU tuning update to meet emissions, so without sacrificing anything but more frequent ad blue fill ups, the engine will meet emissions. In my opinion, this is the worse case scenario for us 15-16 owners.
This is how it works for the heavy duty diesel trucks like the newer generation 6.7L Cummins engines that are in the Ram line up. When EGT's are high from to towing, Urea consumption is very high in order to lower nox output. For highway cruising, the EGT's are lower and so are NOx levels, so the system uses much less urea.
Id assume that even with a largely increased urea consumption, our little 2.0L TDI engines still wouldn't use enough to really be an inconvenience.