Imho the solution to this quickwalling disease: foundations are passable up to 30% (sync it with the look of the foundation itself). And with this you can even block the building from going up if you have a unit stand on it at this moment, you better get army to get it off, clean Drush FC without army (I don't consider militia resonable amount of army)? How boring, go get some army because with my scouts on your blacksmith and market foundation they will never go up. :-)
Yes I'm looking forward to seeing quickwall mastapieces turn into "prevent castle from going up" mastapiece. You see that someone is going for a forward castle? ez, just drop a palisade gate overlapping the foundations directed towards the middle of the castle and get it to 30% in 2 seconds, clearly a perfect solution with no drawbacks