For me, it's knowing that sooner or later a good super hero mmo will come out that is up there with CoH. That someday there will be a game where people get to feel like a super hero(or villain) without it being handed to them on a silver platter and making them a mary sue/marty stu(unlike CO). A game that:
Has challenging gameplay without being a punishing grindfest.
Allows freedom of differing tactics so players aren't only using holy trinity and waiting all day for a healer.
Has good writing in it's stories.
Enables and encourages good roleplaying thanks to the above four things together.
And consequently ends up with a good strong community thanks to those 4 things together rather then the toxic sociopaths that turn into the majority other games get thanks to games forcing people to play a specific way all the time, punishing them, and constant extreme grinds which ultimately serve to discourage social interaction with a false illusion of encouraging it.* (See my note about my feelings towards forced teamplay and enforced holy trinity gameplay).
What I liked about CoH was, no one really teamed with one another because they had no choice to. They teamed with one another cause it was fun to do so. I mean what game let you make successful teams without waiting all day for a rude obnoxious healer. Or without a rude obnoxious necromancer with minions ect? I remember the attitudes I saw in GW and I see the stories online. Yet, then there was CoH, teaming was fun as heck. All blasters? No problem. All controllers or defenders, oooh hell yes. It was the players and skill(and inspirations if needed) that mattered and ultimately everyone knowing how to use their own powers and take advantage of them, not whether a team had x or y role. CoH was just awesome that way, and it ended up encouraging the creation of a very friendly and welcoming community.
*(the holy trinity does NOT encourage people to team with friends, it encourages them to seek out those with healing for the healing abilities or tanks for the role. When your teaming with someone with motives other then liking them and wanting to have a good time with them, thats not encouraging social interaction. It's encouraging narcissism in using others to win, not the same as actually making friends. Your not teaming with people cause you like them, your teaming with them cause you need there roles whether you like it or not. This creates for the kind of sociopathic behavior you can often see in other mmorpgs imo. I'd even say, the holy trinity from what I saw in DCUO, even discourages friends from teaming with one another based on the class. "Oh we cannot use you right now so just um, don't worry about it" was something I saw a lot on my control-character in DCUO in the one league I did get in, cause they already had the role filled and didn't want to kick anyone(since it's rude to do that). I couldn't team with friends for x or y reason all the time, it was frustrating.
People will even team with people they hate if the role is what they need over a friend(assumin the friend doesn't have the role or isn't high enough level ect) in those kind of games. If thats the environment then no wonder sociopathic and bad communities form.).