The dungeon delves need to increase when you hit level 60.
Dungeon delves are the only thing interesting for "most/majority" level 60 pve players....maybe increase the dungeon delves event to 1 per 2 hours or have some kind of key available you can buy for 5k AD or 5 gold to unlock dungeon chests.
P.s Dungeons are of course only worth if chest is unlocked if nobody noticed that by now that is the reason most level 60 pve players are still around.(aside the 40 dollars the spend on a mount haha)
Edit** I like this idea:
http://nw-forum.perfectworld.com/showthread.php?491461-Improving-Dungeons-Dungeon-Delve-Keys
Comments
Don't want DD timer to be more frequent than it is though, as it appears that boss drops are worse during DD timer than non and most players (if not most, a large minority) don't need the chests, they need the BOE drops, since farming dungeons is about the only way to make AD. Enchants are the real "end game" grind in this game, gearing up is just a step.