I feel this is a different line of discussion at this point but yes, Antonio and Sombra are absolutely right in that a relatively balanced story deciding PvP event could be arranged this way. My big issue with this however is the fact that setting up slots and forcing artificial balance completely locks certain people out of a chance to participate, which is not something I think is ideal for server health? The compromise for this in the event yesterday was the unlimited respawns and teleports near the GRN/Corsair bases, all of which worked fairly nicely to allow everyone to stay in the fight.
I'm not saying this format of event won't be considered, but you also can't expect to see that sort of event format produce nearly as high a player count or catch the interest of nearly as many members of the community.