Since we are already getting totems/tokens for the extreme primals, why not put this in?

A: The mount still stays rare.
B: The dungeon is still run to keep the outdated content filled with players.
C: Solves the issue for those who run the dungeon countless times without seeing the mount drop, or if they do, never win the roll. 99 successful runs should be more than enough 'compensation' to earn it.