I am personally against this because, while it may be easier to carry on with your own circle of CR with two more teams running about elsewhere, it's a lot more difficult to create cohesive team relations when you have too many team members to keep up with. To a lot of characters, it's important to have relations with their team or to retain a solid team identity. Expanding teams would impede that and would most certainly lead to OOC frustration on top of IC frustration. Larger teams are much more difficult to coordinate, and I know there are issues with coordination already, even just from the hero side (as opposed to the game-running side).