Kabam has unfortunately stated repeatedly that any updates to any facet of arena will result in changes to all of arena, meaning units will become more difficult to farm. Could they do an update without touching units? Sure, they could, but they won't. Unfortunately Sundays will just remain a waste of space as far as arenas are concerned.
Never touch arena. It’ll only get worse, never better
it would be nice.
Nope, very happy with how Arenas currently is