Why? It would seem you have one of the best in breed. You also probably have it at far lower costs than any of your options?
My full warranty is over today (I was particularly concerned with the HPFP) and I was considering getting the 2012. However, I confirmed with a service mamager that VW has been covering the HPFP, although it is not included in the drivetrain warranty (at least it is not listed). He said they have yet to have VW reject a claim, even after 36,000 and 3 years, . He also said that they have caught the "problem" before massive damage was done. The decontenting of the current Jetta is considerable and the cost of buying the 2012, after my trade-in was much more than my estimate of the costs I will incur by keeping the Jetta for 5 years. So I have decided to keep my 2009.
By the way the service manger, said that the problem with the HPFP was that there is more contamination of diesel fuel here than in Europe. The high pressure causes the gasoline to explode and , over time, the HPFP can be damaged.