Issue: Getting your 60 Elite skills is literally impossible to do at level 60/60 on any character or combination of classes. Defeating a level 75 World Boss is tough enough at level 75. I'm going to compare the level 50 elite skills quests to the level 60 elite skills quests.
For Level 50 Elite Skills Quests:
Kill bosses from level 50 instances to get their "Memories". Do some class specific quests to show that you are competent with your classes. Wait on an item to change forms for 1 month.
For Level 60 Elite Skills Quests:
Use an amulet and trade items with other players to fill up the amulet. Kill or witness a kill of a Level 75 world boss 3 times.
While the 60 Elite skills quests are much less time consuming, they are completely unobtainable to characters that are level 60/60 unless helped by higher level characters. With the 50 Elite skills quests, they were entirely achievable without help from higher level characters and often could be done without the help of other characters of any level.
Suggestion: Since these elite skills should be achievable at level 60/60, I'd suggest you lower the difficulty by getting items from the last bosses in Raksha Temple (Normal or Higher Difficulty), Warnorken Arena, and Dungeon of Dalanis. This would be much more achievable for players level 60/60.