Have you considered adding more active events to PVP and the game world? Such as with Imperial city maybe an NPC Daedric Army (Like In 'The Siege' Trailer) comes out to attack a keep or something. You could get around the problem of siege equipment by making Flesh Atronachs abilities deal bonus damage to Doors and stuff. This would really make the game feel alive and EPIC! Or just extra small things such as patrols moving around the world or groups of bandits, it would make a big difference and make the world feel more natural and alive. Many other MMO's have well done active events and I think ESO could implement these really well and it would really benefit the game world.
House Baratheon: 'Ours Is The Fury'