Here is a list of all the suggested names:
-Lana del Rey: Thinks she's too good as a replacement so she won't come
-Jack White: So exclusive to those 3 shows the weekend before
-LCD Soundsystem: It was empty last time so I don't see it coming
-Pulp: As cool as I would think it would be, I think they are still a size smaller than LCD Soundsystem for the Pukkelpop audience and they don't want to be in the Marquee for The Smile themselves
-Pixies: Same as Pulp, but could maybe be used for The Smile
-Placebo: Can
-The National: Kan
-Massive Attack: Kan
-Justice: Possible, but the December show is not sold out yet, so you could see that as a blockade
-James Blake: I can see that coming for The Smile
-Other Belgian replacement: As a stopgap solution it can of course only be never that big. dEUS in the Marquee for The Smile would be great though