It's hard to say whether the organisers will stop caring or not. It has now gotten to the point, like one or two other smaller festivals, where it sells out every year regardless of the line-up because people are mindless sheep.
Honestly, I'd struggle to put the effort in if I knew it were basically a waste of my time. Thing with Wacken is though, it's a guaranteed good crowd for most bands, so booking them is probably a pretty easy job.
18/12 Black Sabbath
14/1 Iced Earth
18/1 Lamb of God