VW's patented setup sounds far less ideal than the well understood SCR/DEF setup everyone else uses. 20% of max power to burn out the NOx trap? No way in hell would I want that!
The precise temperature controls you allude to for SCR/DEF is hogwash. You've got quite a bit of leeway to get up to temp before the system starts dosing before throwing codes and going into limp mode (think like over an hour of operation). If you didn't, then all of us in places with 4 real seasons would have diesels that wouldn't go anywhere because DEF freezes at about 18 degrees F. Where I live, we can go months with temps lower than that, and it takes time to thaw the DEF so it'll flow.
DEF consumption is 1-3% of fuel consumption. So figure 1-3 gallons of DEF used for every 100 gallons of diesel; that's for the puny little 2 liters in a VW all the way up to the 13L monsters in a Peterbilt... 1-3% of fuel, like clockwork. How many gallons of DEF would be needed to go the oil change interval on a VW TDi? Not many.
Lastly, on DEF, any fool paying stealership prices deserves to get ripped off. Drive to a truck stop and enjoy ISO rated DEF/AdBlue at $2.70 or so a gallon. My last DEF fill cost me a whopping $16 for my truck at just over 6 gallons in ~8k miles.. A 3.0L diesel truck that gets 24-27 MPG in mixed driving. A 2.0L TDi should be able to go 12k+ miles on 5 gallons considering how much less fuel they burn than my truck does.