15 years per the Rick Titus presentation on the DVD that came with the car. Can be viewed at the URL below. Producing parts endlessly isn't going to happen. Alot of the tooling is probably junk by now, and some of it doesn't exist at all. They've already retooled a couple parts from suppliers that went bust (headlights for example), and that comes at a pretty high cost. On the whole, I think the parts availability is good, and it's certainly a lot cheaper than the parts for comparable cars. Just my view, but I would think of 50 transaxles as a near endless supply based on how many actually appear to require replacement.
http://youtu.be/-M1FkJ9j7DM
http://youtu.be/-M1FkJ9j7DM