A reversal on the concept : what if level 80 players gained access to an 'FG mode' where they could play all non-PvP games with the powers of a False God? (It doesn't impact what they gain from Arena farming much since they're already at the top, and seems like a fun thing to mess with once you've exhausted all possibilities in the game.)
Also, what do people think of a tiered group of 'level cards' that people could unlock at certain levels? (E.g. Set 1 unlocked in Bazaar at Level 20, Set 2 unlocked in Bazaar at level 40, etc.. all to way up to Final Set unlocked in Bazaar at level 80.)