Right now 90% of arrows get stuck at the top of the wall without hitting archers behind it, we`ll make it so around 50% of arrows would get stuck there. And the next update would see archers be useless at point-blank range. So for example, if defender has 10 level 1 archer battalions, you would either need 60 level 1 archer battalions, or 20 archers battalions behind a few siege towers. Or you could send a siege tower or two, with several swordsman battalion and completely clear the walls
Also keep in mind - even now if you manually careful position your archers, you can make them hit higher number of units on the walls.