The high point of the current TDI? I'd say the the 2010 Audi Q7 is. The 2011 Touareg goes up a lot in luxury and I'd say it's close the 2011 Q7. The point is that there'll always be another model to choose from, albeit with limited availability. I predict an Audi A4 TDI confirmation to join the Audi A3 TDI and Audi Q7 TDI sometime in 2011 - 2012 for model year 2012-13. With a late introduction of course. I don't know what's taking them so long!
Also, the Jetta TDI does not lose the rear disk brakes for 2011. The TDI and GLI still use rear disk brakes.
My best guess is that the Golf will continue to be made in Europe due to the lower sales volume in the US but higher sales in Europe.
The Jetta will continue to be made in Mexico because it sells very well in North America but not well elsewhere. For the same reason, it has to be competitive with similar class cars and will be designed specifically for North America.
Also, the Jetta TDI does not lose the rear disk brakes for 2011. The TDI and GLI still use rear disk brakes.
My best guess is that the Golf will continue to be made in Europe due to the lower sales volume in the US but higher sales in Europe.
The Jetta will continue to be made in Mexico because it sells very well in North America but not well elsewhere. For the same reason, it has to be competitive with similar class cars and will be designed specifically for North America.