Popular new cars make poor resale used cars, just FYI. Simply because there are SO MANY of them out there. F150s, Camry, etc. fall into that category.
TDIs have traditionally been low volume, yet high demand cars. So they historically had good resale (many still do, despite what some think).
I myself cannot grasp buying a TDI for a short term, at least short enough that any sizable amount of resale value would factor in to the deal. They do not seem to me to be a good short term type of car, especially newer ones, because the cost premium to buy one is so high.
So that is where I won't ever understand why so many people are all ranting about a drop in value... because I wouldn't be selling a car I just bought (I still have the last new TDI I bought 12 years ago). I do understand if you bought a car and then circumstances changed (had a bunch of kids, changed jobs, etc.) that sort of placed you in a position where your current TDI does not fit your needs any longer. But beyond that, I don't get it. If the car is still operating as it was when you got it, and it still fills the needs of your transportation, then why not just keep driving it? Certainly, especially, now would be the time to do that if there ever was one.
If not, there are people that are willing to drive it, and they are out there. I am one of them.