Yep. Nothing like a new monster defensive building to bring the attack AI's targeting and pathfinding back into focus. They're really running the risk of player burnout by making raiding such a chore.
I would guess 80% of the player base are IA and above at this point. I have a GP alt and it hasn't been attacked in 40 days despite full resources and a shabby layout. So it doesn't appear there are too many newbies coming in. They really can't afford to alienate long timers.