Not to say that I disagree with any of this whatsoever, but...
In order to strengthen our argument, I get the idea it would be wise to play a bit of "devils advocate" with you all and ask a question that I'm sure would be a counter-argument. I do this solely in the interest of putting it out there and having you find a way to counter it.
The question is this: How much of these beneficial aspects are due to any unique nature of City of Heroes, and how much could be attributed to any other MMO out there? Could you not get these same benefits by going to Guild Wars 2 or Aion? Or even Blade and Soul?
(I use those examples because I'm trying to do this from the POV of the NCSoft execs. I suspect one thing they'd love is for this community to move to another of their games. Remember - devil's advocate position here.)
Think about the above - now find a way to counter that argument. Try not to come at it from a purely emotional reaction - what unique aspects of City of Heroes foster the beneficial aspects you've all been talking about and are found NO WHERE else?
General reasons:
City of Heroes offers an incredible creative outlet, with the immensely powerful Character Creator as well as Mission Architect.
City of Heroes is an easy game to learn to play, accessible to younger children and non-gamers.
City of Heroes does not have the 'Holy Trinity', nor is City of Heroes the type of game where if you don't take a specific build you're gimped.
City of Heroes is very friendly to mixed team play, assorted levels, assorted skill levels, assorted archetypes.
City of Heroes Is fairly solo friendly with the right archetype and build.
City of Heroes is very casual player friendly.
A couple of instance specific reasons:
Autistic children or other developmental disabilities: City of Heroes is a very 'bright and shiny' game of superheroes. Young children tend to like bright shiny superheroes.
For those who deal with physical impairments: City of Heroes is a very easy game to play, and can even be played entirely 1 handed. It does not rely on the speed and dexterity of the player.