Rank cap is fine, but instead of limited higher rank players from enter, I think it is better to "reduce players rank into 30 as soon as one enter the place". So people with all-classes cap-50 can still do them.


Another things is that I m against the idea of disable all the skills that optimize at 30+ rank. Those skills aren't much better than lower rank skills, just more variety and very little upgrade. If you disable them, instead of bring more challenge, it will only bring more annoyance because they will have to change their skill set just for only one dungeon.