VWMOM,
If you're dealer is willing to change your TB and related parts under warranty- i say go for it! As long as you are the original owner- and covered w/ the 10yr/100k powerterrain warranty, w/ all proper maintenance record- then you're good to go. I have a 99 Passat 1.8t wagon(tip)-- and although their manual said 105k for TB change- the TB tensioner BROKE at 81k, right after the 80k service. They did change the parts, repair the car under warranty since i was the original owner and the fact that i have records of maintenance and that they've just finished the 80k service. (I also got a new turbo out of it--different story-but nevertheless, under warranty).
So you want to drive your car for another 68k? I think you won't have any issues on that- being that you take good care of your car. My car now has 143k (almost 144k, should be in 200miles) and running well. I am however going through some, from what i call "second life cycle" preventative maintenance and updates as i want to keep her until perhaps 200k or more.
Happy motoring.
Erick