I can't see how a suicide rear door is any cheaper to build than the
utterly brilliant canterlever doors on the concept car
That was neat looking, practical, virtually unique and extremely clever, whereas the suicide door is only one of those things
I can't see that the barn rear doors are that expensive a solution as virtually every van manufacturer uses almost exactly the same idea, except they make them fold back though a much more practical 180 degree arch
One thing will be interesting to see if they've sorted; in a van the join between the barn doors is the greatest source of squeaks and rattles in the entire van. With what it effectively two sets of barn doors (one right next to the driver's right ear) they will definitely have to have put a lot of effort into sorting that one out...