Do you think they will ever

- Because almost everything from KMS translates to GMS exactly and there aren't that many differences

- Also, bishops have more advantages to gain/save mesos due to current situations, skills, etc over archmages.

You have no proof of this. For all we know, GMS implemented these Element Weapons so more people would Gacha and by doing that, Nexon would earn more money from this.

Bishops may save in pots and gain meso, but the amount isn't so significant that it would allow any Bishop to afford an Element Weapon. Like I said, Arch Mages should find a way to make money just like the Bishops that have Element Wands.