Higher up front coast doesn't seem to be stopping sales at the Cadillac dealership. Maybe you're getting something worth paying for?
I totally get what you're saying here, but "Cadi" is a bad example. They're getting killed by other "Luxury" brands (e.g.; MBZ, BMW, Audi, Lexus, etc.) and their resale value is atrocious.
That being said, next family hauler is a Cadi (they've been making great strides and in the segment I'm looking at there really isn't a better option).
Regarding lighting, I don't believe I've seen a single pic, read science supporting, or heard testimony that would drag me away from HID. I'm open to significant change, but only when it's cost to benefit makes sense. LED just isn't there yet.