The point of bringing it back is because its a fun challenge, you dont need the old rewards to bring back mage tower. I think that line of thinking is a bit ridiculous.
There is so much they can offer from the mage tower for rewards, they dont need to bring back old skins. Class/spec sets, class/spec tabards, class/spec titles, class/spec mounts, etc. They have so many new rewards they could have come from the mage tower, thats the way they should go. If the mage tower is going to continue into the future, it needs new and constant rewards alongside new challenges. There were plenty of reasons to bring MT back that have nothing to do with the artifact skins, its just a fun challenge. There is a ton of new rewards they could and should put behind mage tower.