I guess they can stop selling golden repair hammers etc. never be needed again So for the price of a couple of platinum repair hammers they can eliminate their most profitable items great business model.
Not necessarily true, considering the fact that most end game players don't bother using any UD equipment (personally I only have two, my mainland and my wings), the use of golden repair hammers is absolutely useless. I just use master's simple repair hammer to bring back my dura if I die and occasionally pop a golden repair to bring back dura of mainland and rarely ever for my wings.
Now if UD gear could be made to be OD, I wouldn't mind obtaining a full set of UD gear (18 pieces for me) and plus them all to be permanent OD. 18x300 diamonds.... Hmmm..5,400 diamonds is $100 for RoM. In the last 4 years I've played if I converted diamonds spent on golden repair hammers to real life money, I've spent <$20 on golden repair hammers.