I can't see any changes of any real magnitude being implemented before Shadowbringers. With a whole expansion on the way, I don't see why they'd opt for anything drastic when a lot of other things are just around the corner. I'd say you'd be right to be concerned if Shadowbringers came out and WHM still remained in a straight-line its on, but not so much from minor pre-expansion patches. As it stands, I just welcome the positives and hope we get more when the big bang happens.