The issue is not whether the lineup is curated for him, me or you. It's what RW historically has been selling and what people anticipate from them. A lot of people has for many years been buying combo tickets based on their track record of good bookings and always among the best (if not the very best) line-up for those looking for that genre. If they want to change that, that's in their right to do so and I'm not even going to debate if it's right or wrong, but at least be up front about it.
I've always bought my combo tickets, knowing that from time to time headliners hasn't been to my taste (because you always know up front), but until last year, they've never disappointed in making the total package looking very good. I can accept a young up & coming headliner and even something that is not related to rock, but If they want to turn one or two whole days into some kind of Coachella/Lollapalooza-circus, I expect them to notify me about such a change in festival category in advance. It will also affect the whole vibe of the festival, which up to know has had a mix of people and ages that has contributed to it's success.
Although I've hated that obvious "joke" of it's not Pop Werchter but Rock Werchter for many years now, maybe they actually should do themselves a favor and remove the rock from it's brand to mark the new direction. It will at least save themselves for a bunch of hassle... Again, we don't know how it will end up looking this year, it might be the Sunday will look completely different when the timetable comes, but I've got a sneaky feeling it won't and RW has always been terrible when it comes to communication.