I've said this before, the devs that keep pushing for this GvG boon ball meta NEEDS to make a separate instance where these guilds can do this. These changes that cater to this specific type of content ruins the rest of this "cornerstone" game mode.
So far they've ruined every counterplay to fight these blobs outside of another blob. From AOE damage (Meteor Shower, Burn Guards) to Boon Rips (Mesmer, Scourge, Spellbreaker). Now they've destroyed sieges.