No petrol Avants either? That's even more strange. SUV's and crossovers got more and more popular over the years in Europe too, but usually there not as big.
This side of the pond, a station wagon is considered more beautiful and Practical than the sedan version by most people, so the 3-volume body work cars offerings are getting smaller. That would mean, if Audi would cancel an A6 version, it would be the sedan.