Forgive me, but how is increasing the defense pools good news?
If I'm reading that correctly, there's more players you can be drawn against when invading in PvP?
This is a bad thing as far as I can see. The majority of ranked battles are against teams consisting of the same troops. Wraith, BD, Courage, Famine and the other few troops used by the masses. Unless I take a dip into 1 trophy battles, I face the same thing time and again.
Adding more people to the pot is further adding more of the same repetitive battles. For every 100 people added there's going to be say 75 using the current meta or a bastardised version of it and 25 who are not. All this does is decrease the likeliness of finding a varied team to fight.
If in Guild Wars there's going to be an added incentive to using certain defense teams, why not add something like this to PvP?