Let's get away from the old MMORPG tropes and have it be something unique. For instance, how many MMORPG rely on the dps, tank, and healer setup? Also, cooldowns in general just make me feel like I'm playing games that are clones of each other.

And before you say, it will never work! Remember, we're talking about making a new game here. It needs some creativity, and don't be someone not willing to think outside of the box due to fear of change.