A huge part of the player base likes the feature, many play the game for it almost exclusively. So you are about as wrong as one can possibly be.Blizzard is putting so much effort into the new weapon and armor models for Uldir (along with much of the past content that has came out). All this effort and time is being put into something that majority of players will simple transmog into something else. This kills the dignity and value that was associated behind having a complete set.
Back in classic/BC/wrath/early cata, raiding came with many rewards and one of the more essential aspects to this reward was wearing a full matching set of gear from the latest raid tier. Raids offered not only a character stat reward but also a universal cosmetic reward too. By adding transmog into the game during cata, you're essentially killing motivation for players to pursue any higher level content as someone with all greens could have any appearance he pleases. This is essentially why mythic(old heroic) participation has declined drastically.
Now transmog shouldn't be removed per say, it should simply have a variety of restrictions to it. Something like you need a piece of gear from the current raid in order to transmog that piece into a piece of gear from a previous raid as it doesn't make sense for a player who doesn't raid to have transmogged gear from a raid. There is simply no rational logic in that.