Your forgetting one thing. The R30 gear and R30 dungeon are not ment for players who have already gottn to R50.
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All my DoWDoM classes are 47-50... So... Thanks for the 1 dungeon SE. ;) Haha
... caping would be nice for the 50ies since they would have a chance to at least have a challenge. caping doenst mean "you cant enter" it just adjusts your lvl to the dungeon.
Another smart way would be to scale the mobs to the highest player in the group but then the drops would have to be adjusted as well. But anyways. One thing i know is... you will need crafts for repairing only in the future... unless they change a lot but then i wont have to bother with crafting.