I too am a 2X Routan owner and agree with everything RoutanVanMan stated above. These are incredible used car values. I personally have not seen a difference in used vehicle pricing, but if there do depreciate slightly more than the Chrysler twins only makes it that much better of a purchase outside of buying new.For future readers I will respond to the original question, AND the Routan question! I'll tackle Routan first.
I have had one for 3 years. I literally just bought a 2nd this week. Mainly because it was the one with the miles/options/price that worked for me. I DO prefer the styling a bit though over the others, but would have been perfectly happy getting a T&C too. Amusingly people do perceive it to be fancier because of the VW badge too, so I don't correct people most of the time!
You're simply WRONG that you can't find parts. First off you can order MOPAR parts for basically everything, not to mention aftermarket intended for Dodge/Chrysler. So no issue there. With respect to the few interior/exterior bits... They don't offer some of it new, true. But you're WRONG about not being able to find stuff in junkyards. You ever look at http://www.car-part.com/ ? It's a goldmine! There are endless parts for any trim level/color you can imagine. The new one I just picked up was a screaming deal for the mileage, but it had a small crunch in a fender. I went and found numerous Routans with my original paint color with perfect fenders for peanuts. Same could be done for any interior bits. Maybe your local scrap yard doesn't have them piled up like T&Cs because they didn't sell as well, but there's zero issue finding anything I've ever needed online at great prices.
The one and only downside is that for the very few things you need full specialized computer access for you do have to go to a VW dealer, and they nail you harder. But for any regular stuff any mechanic can work on it just as easy as a Dodge. I only needed to bring it to the dealer once, and paid maybe $20-30 more than I would have at a Dodge dealer. BIG DEAL.
Amusingly the Routan has a lower resale value, simply because people don't know they even exist. Identical vans on KBB always come it a lot less compared to T&C. So you can score a better deal, which is a nice upside. This probably leaves you well ahead of the game vs T&C if you don't plan to resell quickly yourself. The stow n go seats are cool, and Routan doesn't have them, but that's literally the only negative. You can always swap them in for peanuts by buying scrapyard seats and the floor panels.
So turning people away from the Routan is not a valid thing for any logical reason.
I prefer the styling and receive positive comments all the time. The second row seating depends on your needs, if you really want to stow the seats then go with the Chrysler or swap out the second row. The Routan's second row seats are much more comfortable for anyone outside of a carseat. Those are the main differences. I have had no issues finding parts new or used for either vehicle. I've replaced a front fender and a couple tail lights with no problems.
As long as you're not planning to add factory options like the RES or fog lights you won't need to bring it to a VW dealer for anything outside a recall.
VW didn't kill it off because it was unreliable, at the time VW was shooting to be the largest manufacturer and needed a minivan, those plans changed and sales were slow - probably because no one knew they had them.