I was speaking with Perjad at Precision Tuning yesterday and he said most of his customers are having the fix applied and keeping the cars (unless they are already worn out). Also used A6 and A7 TDI prices have gone nuts (~30,000 a year ago, close to $50,000 now). Paying that much of a premium for a diesel is crazy.
The scary thing is the fix is apparently two stages, you have to get the first stage done now (which reduces torque) and they don't know what the second stage is yet. VW is hoping more of the cars will be worn out/crash before they have to pay for the next round.
I was planning on turning it in in a year, but I am not so sure anymore (6L/100 km last weekend pulling a 1000lb 25'x6'x6' trailer on the 401).