I would like to see a sort of infinite progression system in AOC that doesn't rely on grinding or daily quests or logins. Just a passive/semi-passive system for either each character, or for the account.
In Eve Online, the way you get skills is you basically pick a skill and wait X amount of real life time for it to finish. In the beginning it takes minutes, then hours, days, and weeks. Other than adding skills to the skill-queue, you really don't have to spend much ingame playing time on character progression.
For AOC I only want a similar system in spirit. It shouldn't increase character combat ability I think, for balance purposes, but there are other things we can do. Obviously this is scope creep, so I don't want it to delay release, just sometime after.
Below is one idea, but I am sure you guys can think of more.
Dance Dance Revolution
Dance moves. You start with a side step, then you can train more and more steps, twists, twirls and poses along the way, so that after a couple of years of RL time you can dazzle all the newbies with your
EPIC
dance moves. Combine it with a choreography system, where you put in your moves in the desired order and save the finished dance, so you can fire it off with the push of a button. Let characters specialize in different styles, so not everyone is the same.