Words cannot describe how thrilled I am to bring this forward, I have not searched for a post regarding this type of suggestion, 1) If one such a post exists, then it should have been a hot topic, 2) I feel I must express this in my own words.
Let me begin…
I had always wondered if there would be some greater purpose for our mini-pets, then, one day the thought had hit me like a truck, what if instead of them supposedly meant to have been part of some tiny meaningless arena, what if all the mini-pets (maybe not so much the actual pet types i.e cats/dogs etc), the heroes and strange creatures we have collected were part of a hero list to be played inside a “DOTA/HoN/LoL” style map in 3rd person, each baring their own unique skills and abilities, each bearing a tab where we can view the characters history and part they played in the GW2 lore.
More incentive would come from the community as those who want to play these games would have to go out and collect these heroes. As it will have its own ranking/leader board system, unique skins for each hero purchasable via gem store or maybe even found throughout the world.
The variety for the game will grow futher more, you will have the crowds to cater to all types, for this, for the spvp, the wvw and the pve.
Personally I hope something like this would be implemented, just my 2 cents