First of all, there is no more Pink Floyd; Dave said the band ended after The Endless River (I really don't even consider it a PF album without Rick, just more of a Dave solo album with a PF sticker put on it), so if anyone were to release it, it'd most likely just be Dave. There is no more "them."

Secondly, after all Dave went through, I'd think he'd want to leave his Pink Floyd happenings in the past (his bickering with Waters and all). Releasing The Wall memorobilia would dig up old memories he'd most likely not want to remember.

Of course, this is all just a theory, but it's my thinking and I'm sticking with it for now. Honestly, though, I'd love to be proved wrong by Dave (or Waters, you never know) by one of them releasing something to commemorate The Wall.