Given the large amount of Fortress destruction now available, I have thought of a new class of card that could mitigate this: Gates/Walls/Defensive Works. Territory class. May be placed on a fortress to act as a protect (not unlike what Glory of the Lord does for Solomon's Temple).
Reprint such cards as Gates of Samaria and Gates of Jerusalem. Many sites and Fortresses would lend themselves to this type of card construct.
Thoughts?