There's lots of ways to look at this, but I'll give you my jaundiced eye approach. Just note that this is a worst case scenario kind of look at it, so if my comments don't discourage you, then maybe the TDI is the way to go.
1. If you have to ask, the answer is no.
2. If you don't like to do maintenance, the answer is no. Not that TDIs are garage queens or anything like that, but they are kinda sensitive about having maintenance done on time and correctly. Having said that, dealers are not the preferred venue for maintenance nor most complex repairs. There are however, various well regarded individuals who are known for taking care of TDIs and doing it properly at much less than dealer rates. So if you are disinclined to do your own wrenching, there is probably one close by. If a good TDI guy isn't close by, and you refuse to drive there, and you won't turn your own wrenches, then the answer is no.
3. The engine not warming up in a 15 minute commute: yeah, and it can be a problem. Surprise, it is a big problem for gassers too, but since they reject so much more heat than a TDI does, they will warm up lots faster. Short cold commutes: I was doing that for a couple of years until the end of last summer, and it looks like I'll be in that situation again very soon. What I always did and will do is at least once a week, and sometimes more, is choose a scenic route home or to work, and drive it such that the total trip is 10 miles or more. One of the main problems in cold engines is that without warming up, moisture can collect in the oil pan or in other cavities and cause trouble in the oil or in corrosion elsewhere. Also, more wear happens when engines are cold. The wear problem is usually because of cold oil not flowing as well or being pressed out of bearings when settled and not running producing a moment (or longer) where the bearing is being run without lubrication. This is usually a transitory condition and is more a function of the number of cold starts than anything else. Better oils ameliorate this somewhat.
4. Not warming the engine sufficiently is hard on the oil and may necessitate oil changes more frequently than the recommended 10k mile OCI (oil change interval).
5. Mis-fueling your car will have drastic negative consequences. A gallon by mistake and then filling the tank with diesel and extra lube additive of your choice may be all it takes to keep you going OK, but a batch of bad diesel at a station will ruin your day.
6. The Prius crowd cannot manage the concept that you are at least as green (by some accounts more so) as they are. Don't think you'll ever get acceptance or sympathy.
7. "It's stinky!" - probably you won't hear this as much as I do since your catalytic converter would be new and actually working, but it might happen. Some people just don't realize that when the tables are turned, gassers are just plain toxic and can only be made marginally less so with perfect converter operation. And since all catalytic converters head south from there, that is just the way it is.
8. It's a VW. This can be thought of as both good and bad, and either way you're right. I'm not impressed with dealer stories, but all makes have dealers that do things badly. VW corporate (VWAG as well as VWoA), on the other hand, has every reason to enhance their product offerings in this country and bring over some very interesting product, yet they refuse to do so. Makes me think they (VWAG) really think of us 'muricans as some kind of inferior being. So... the upshot of this is don't think VW really means it when they advertise crap that sounds similar to 'we love our customers' because it plays more like "we love our customer's money but don't really care for the customer themselves."